NAICS Codes by Business Activity: H
821 business activities
| Business activity | NAICS code | Size standard |
|---|---|---|
| Habilitation job counseling and training, vocational | 624310 Vocational Rehabilitation Services | $15 million in average annual receipts |
| Haddock fishing | 114111 Finfish Fishing | $25 million in average annual receipts |
| Hafnium mining and/or beneficiating | 212299 All Other Metal Ore Mining | 750 employees |
| Hair accessories merchant wholesalers | 424310 Piece Goods, Notions, and Other Dry Goods Merchant Wholesalers | 100 employees |
| Hair care products (e.g., combs, curlers), rubber, manufacturing | 326299 All Other Rubber Product Manufacturing | 650 employees |
| Hair clippers for animal use, electric, manufacturing | 333111 Farm Machinery and Equipment Manufacturing | 1,250 employees |
| Hair clippers for animal use, nonelectric, manufacturing | 332216 Saw Blade and Handtool Manufacturing | 750 employees |
| Hair clippers for human use, electric, manufacturing | 335210 Small Electrical Appliance Manufacturing | 1,500 employees |
| Hair clippers for human use, nonelectric, manufacturing | 332215 Metal Kitchen Cookware, Utensil, Cutlery, and Flatware (except Precious) Manufacturing | 1,000 employees |
| Hair coloring preparations manufacturing | 325620 Toilet Preparation Manufacturing | 1,250 employees |
| Hair curlers, household-type electric, manufacturing | 335210 Small Electrical Appliance Manufacturing | 1,500 employees |
| Hair curlers, metal, manufacturing | 332999 All Other Miscellaneous Fabricated Metal Product Manufacturing | 750 employees |
| Hair driers, electric (except equipment designed for beauty parlor use), manufacturing | 335210 Small Electrical Appliance Manufacturing | 1,500 employees |
| Hair dryers merchant wholesalers | 423620 Household Appliances, Electric Housewares, and Consumer Electronics Merchant Wholesalers | 225 employees |
| Hair dryers, beauty parlor-type, manufacturing | 333318 Other Commercial and Service Industry Machinery Manufacturing | 1,000 employees |
| Hair nets made from purchased netting | 339999 All Other Miscellaneous Manufacturing | 550 employees |
| Hair preparations (e.g., conditioners, dyes, rinses, shampoos) manufacturing | 325620 Toilet Preparation Manufacturing | 1,250 employees |
| Hair preparations (except professional) merchant wholesalers | 424210 Drugs and Druggists' Sundries Merchant Wholesalers | 250 employees |
| Hair preparations, professional, merchant wholesalers | 423850 Service Establishment Equipment and Supplies Merchant Wholesalers | 125 employees |
| Hair removal (i.e., dipilatory, electrolysis) services | 812199 Other Personal Care Services | $9 million in average annual receipts |
| Hair replacement services (except by offices of physicians) | 812199 Other Personal Care Services | $9 million in average annual receipts |
| Hair sprays manufacturing | 325620 Toilet Preparation Manufacturing | 1,250 employees |
| Hair stylist salons or shops, unisex or women's | 812112 Beauty Salons | $9.5 million in average annual receipts |
| Hair stylist services, men's | 812111 Barber Shops | $9.5 million in average annual receipts |
| Hair stylist services, unisex or women's | 812112 Beauty Salons | $9.5 million in average annual receipts |
| Hair stylist shops, men's | 812111 Barber Shops | $9.5 million in average annual receipts |
| Hair weaving services | 812199 Other Personal Care Services | $9 million in average annual receipts |
| Hairbrushes manufacturing | 339994 Broom, Brush, and Mop Manufacturing | 750 employees |
| Hairbrushes merchant wholesalers | 424990 Other Miscellaneous Nondurable Goods Merchant Wholesalers | 100 employees |
| Hairdresser services | 812112 Beauty Salons | $9.5 million in average annual receipts |
| Hairdressing salons or shops, unisex or women's | 812112 Beauty Salons | $9.5 million in average annual receipts |
| Hairpieces (e.g., toupees, wigs, wiglets) manufacturing | 339999 All Other Miscellaneous Manufacturing | 550 employees |
| Hairpieces (e.g., toupees, wigs, wiglets) merchant wholesalers | 424990 Other Miscellaneous Nondurable Goods Merchant Wholesalers | 100 employees |
| Hairpins (except rubber) manufacturing | 339993 Fastener, Button, Needle, and Pin Manufacturing | 750 employees |
| Hairpins, rubber, manufacturing | 326299 All Other Rubber Product Manufacturing | 650 employees |
| Hairsprings (except clock, watch), light gauge, made from purchased wire or strip, manufacturing | 332613 Spring Manufacturing | 600 employees |
| Hake fishing | 114111 Finfish Fishing | $25 million in average annual receipts |
| Halfway group homes for delinquents and ex-offenders | 623990 Other Residential Care Facilities | $16 million in average annual receipts |
| Halfway houses for patients with mental health illnesses | 623220 Residential Mental Health and Substance Abuse Facilities | $19 million in average annual receipts |
| Halfway houses, substance abuse (e.g., alcoholism, drug addiction) | 623220 Residential Mental Health and Substance Abuse Facilities | $19 million in average annual receipts |
| Halibut fishing | 114111 Finfish Fishing | $25 million in average annual receipts |
| Hall and banquet room, nonresidential, rental or leasing | 531120 Lessors of Nonresidential Buildings (except Miniwarehouses) | $34 million in average annual receipts |
| Hall effect devices manufacturing | 334413 Semiconductor and Related Device Manufacturing | 1,250 employees |
| Hall, nonresidential, rental or leasing | 531120 Lessors of Nonresidential Buildings (except Miniwarehouses) | $34 million in average annual receipts |
| Halls of fame | 712110 Museums | $34 million in average annual receipts |
| Halogen light bulbs manufacturing | 335110 Electric Lamp Bulb and Part Manufacturing | 1,250 employees |
| Halogenated aromatic hydrocarbon derivatives manufacturing | 325194 Cyclic Crude, Intermediate, and Gum and Wood Chemical Manufacturing | 1,250 employees |
| Halogenated hydrocarbon derivatives (except aromatic) manufacturing | 325199 All Other Basic Organic Chemical Manufacturing | 1,250 employees |
| Halvah manufacturing | 311340 Nonchocolate Confectionery Manufacturing | 1,000 employees |
| Hammer forgings made from purchased iron or steel, unfinished | 332111 Iron and Steel Forging | 750 employees |
| Hammer forgings made from purchased nonferrous metals, unfinished | 332112 Nonferrous Forging | 950 employees |
| Hammer mill machinery (i.e., rock and ore crushing machines), portable, manufacturing | 333120 Construction Machinery Manufacturing | 1,250 employees |
| Hammer mill machinery (i.e., rock and ore crushing machines), stationary, manufacturing | 333131 Mining Machinery and Equipment Manufacturing | 900 employees |
| Hammers, handtools, manufacturing | 332216 Saw Blade and Handtool Manufacturing | 750 employees |
| Hammers, piano, manufacturing | 339992 Musical Instrument Manufacturing | 1,000 employees |
| Hammers, wood, meat, manufacturing | 321999 All Other Miscellaneous Wood Product Manufacturing | 500 employees |
| Hammocks, fabric, manufacturing | 314999 All Other Miscellaneous Textile Product Mills | 550 employees |
| Hammocks, metal framed, manufacturing | 337124 Metal Household Furniture Manufacturing | 750 employees |
| Hammocks, wood framed, manufacturing | 337122 Nonupholstered Wood Household Furniture Manufacturing | 750 employees |
| Hampers, laundry, plastics, manufacturing | 326199 All Other Plastics Product Manufacturing | 750 employees |
| Hampers, laundry, reed, wicker, rattan, manufacturing | 337125 Household Furniture (except Wood and Metal) Manufacturing | 750 employees |
| Hampers, laundry, sheet metal (except stampings), manufacturing | 332322 Sheet Metal Work Manufacturing | 500 employees |
| Hams (except poultry) produced in slaughtering plants | 311611 Animal (except Poultry) Slaughtering | 1,150 employees |
| Hams, canned, made from purchased carcasses | 311612 Meat Processed from Carcasses | 1,000 employees |
| Hams, poultry, manufacturing | 311615 Poultry Processing | 1,250 employees |
| Hams, preserved (except poultry), made from purchased carcasses | 311612 Meat Processed from Carcasses | 1,000 employees |
| Hand blowing purchased glass | 327215 Glass Product Manufacturing Made of Purchased Glass | 1,000 employees |
| Hand held computers (e.g., PDAs) manufacturing | 334111 Electronic Computer Manufacturing | 1,250 employees |
| Hand knitting lace or warp fabric products | 313240 Knit Fabric Mills | 500 employees |
| Hand laundries | 812320 Drycleaning and Laundry Services (except Coin-Operated) | $8 million in average annual receipts |
| Hand lotions manufacturing | 325620 Toilet Preparation Manufacturing | 1,250 employees |
| Hand operated stamps (e.g., canceling, postmark, shoe, textile marking) manufacturing | 339940 Office Supplies (except Paper) Manufacturing | 750 employees |
| Hand soaps (e.g., hard, liquid, soft) manufacturing | 325611 Soap and Other Detergent Manufacturing | 1,100 employees |
| Hand stamps (e.g., date, time), timing mechanism operated, manufacturing | 334519 Other Measuring and Controlling Device Manufacturing | 600 employees |
| Hand trucks manufacturing | 333924 Industrial Truck, Tractor, Trailer, and Stacker Machinery Manufacturing | 900 employees |
| Hand weaving fabric, 12 inches or less (30cm) | 313220 Narrow Fabric Mills and Schiffli Machine Embroidery | 550 employees |
| Hand weaving fabrics, more than 12 inches (30 cm) in width | 313210 Broadwoven Fabric Mills | 1,000 employees |
| Handbag leather manufacturing | 316110 Leather and Hide Tanning and Finishing | 800 employees |
| Handbag stores | 448150 Clothing Accessories Stores | $29.5 million in average annual receipts |
| Handbags (except metal), men's, manufacturing | 316998 All Other Leather Good and Allied Product Manufacturing | 500 employees |
| Handbags merchant wholesalers | 424330 Women's, Children's, and Infants' Clothing and Accessories Merchant Wholesalers | 100 employees |
| Handbags, precious metal, manufacturing | 339910 Jewelry and Silverware Manufacturing | 700 employees |
| Handbags, women's, all materials (except precious metal), manufacturing | 316992 Women's Handbag and Purse Manufacturing | 750 employees |
| Handball club facilities | 713940 Fitness and Recreational Sports Centers | $17.5 million in average annual receipts |
| Handbill direct distribution services | 541870 Advertising Material Distribution Services | $28.5 million in average annual receipts |
| Handcuffs manufacturing | 332999 All Other Miscellaneous Fabricated Metal Product Manufacturing | 750 employees |
| Handheld edge tools (except saws, scissors-type), nonelectric, manufacturing | 332212 Hand and Edge Tool Manufacturing | — |
| Handheld edge tools (except scissors-type), nonelectric, manufacturing | 332216 Saw Blade and Handtool Manufacturing | 750 employees |
| Handicapped passenger transportation services | 485991 Special Needs Transportation | $19 million in average annual receipts |
| Handicapped, schools for, elementary or secondary | 611110 Elementary and Secondary Schools | $20 million in average annual receipts |
| Handicrafts instruction | 611610 Fine Arts Schools | $9 million in average annual receipts |
| Handkerchiefs (except paper) cut and sew apparel contractors | 315210 Cut and Sew Apparel Contractors | 750 employees |
| Handkerchiefs (except paper) cut and sewn from purchased fabric | 315990 Apparel Accessories and Other Apparel Manufacturing | 600 employees |
| Handkerchiefs (except paper), men's and boys', cut and sew apparel contractors | 315211 Men's and Boys' Cut and Sew Apparel Contractors | — |
| Handkerchiefs (except paper), women's, girls', and infants', cut and sew apparel contractors | 315212 Women's, Girls', and Infants' Cut and Sew Apparel Contractors | — |
| Handkerchiefs, paper, made from purchased paper | 322291 Sanitary Paper Product Manufacturing | 1,500 employees |
| Handle blanks, wood, manufacturing | 321912 Cut Stock, Resawing Lumber, and Planing | 500 employees |
| Handle stock, sawed or planed, manufacturing | 321912 Cut Stock, Resawing Lumber, and Planing | 500 employees |
| Handles (e.g., broom, mop, handtool), wood, manufacturing | 321999 All Other Miscellaneous Wood Product Manufacturing | 500 employees |
| Handles (e.g., broom, mop, paint) merchant wholesalers | 424990 Other Miscellaneous Nondurable Goods Merchant Wholesalers | 100 employees |
| Handles (e.g., brush, tool, umbrella), plastics, manufacturing | 326199 All Other Plastics Product Manufacturing | 750 employees |
| Handles (e.g., luggage, whip), leather, manufacturing | 316998 All Other Leather Good and Allied Product Manufacturing | 500 employees |
| Handles (e.g., parasol, umbrella), metal, manufacturing | 332999 All Other Miscellaneous Fabricated Metal Product Manufacturing | 750 employees |
| Handles, faucet, vitreous china and earthenware, manufacturing | 327110 Pottery, Ceramics, and Plumbing Fixture Manufacturing | 1,000 employees |
| Handtool industrial design services | 541420 Industrial Design Services | $17 million in average annual receipts |
| Handtool metal blades (e.g., putty knives, scrapers, screw drivers) manufacturing | 332216 Saw Blade and Handtool Manufacturing | 750 employees |
| Handtools (except motor vehicle mechanics', machinists' precision) merchant wholesalers | 423710 Hardware Merchant Wholesalers | 150 employees |
| Handtools, machinists' precision, manufacturing | 332216 Saw Blade and Handtool Manufacturing | 750 employees |
| Handtools, machinists' precision, merchant wholesalers | 423830 Industrial Machinery and Equipment Merchant Wholesalers | 100 employees |
| Handtools, motor vehicle mechanics', manufacturing | 332216 Saw Blade and Handtool Manufacturing | 750 employees |
| Handtools, motor vehicle mechanics', merchant wholesalers | 423120 Motor Vehicle Supplies and New Parts Merchant Wholesalers | 200 employees |
| Handtools, power-driven, manufacturing | 333991 Power-Driven Handtool Manufacturing | 950 employees |
| Handtools, power-driven, repair and maintenance services retailing new power-driven handtools | 444130 Hardware Stores | $14.5 million in average annual receipts |
| Handtools, power-driven, repair and maintenance services without retailing new power-driven handtools | 811411 Home and Garden Equipment Repair and Maintenance | $9 million in average annual receipts |
| Handwriting analysis services | 541990 All Other Professional, Scientific, and Technical Services | $19.5 million in average annual receipts |
| Handwriting expert services | 541990 All Other Professional, Scientific, and Technical Services | $19.5 million in average annual receipts |
| Handyman construction service, commercial and institutional building | 236220 Commercial and Institutional Building Construction | $45 million in average annual receipts |
| Handyman construction service, residential building | 236118 Residential Remodelers | $45 million in average annual receipts |
| Hang gliders manufacturing | 336411 Aircraft Manufacturing | 1,500 employees |
| Hangar construction | 236220 Commercial and Institutional Building Construction | $45 million in average annual receipts |
| Hangar doors, metal, manufacturing | 332321 Metal Window and Door Manufacturing | 750 employees |
| Hangar rental, aircraft | 488119 Other Airport Operations | $40 million in average annual receipts |
| Hangers, wooden, garment, manufacturing | 321999 All Other Miscellaneous Wood Product Manufacturing | 500 employees |
| Hanging basket plant growing | 111422 Floriculture Production | $3.8 million in average annual receipts |
| Harbor construction | 237990 Other Heavy and Civil Engineering Construction | $45 million in average annual receipts |
| Harbor maintenance services (except dredging) | 488310 Port and Harbor Operations | $47 million in average annual receipts |
| Harbor operation | 488310 Port and Harbor Operations | $47 million in average annual receipts |
| Harbor sightseeing tours | 487210 Scenic and Sightseeing Transportation, Water | $14 million in average annual receipts |
| Harbor tugboat services | 488330 Navigational Services to Shipping | $47 million in average annual receipts |
| Hard banding oil and gas field service on a contract basis | 213112 Support Activities for Oil and Gas Operations | $47 million in average annual receipts |
| Hard candies manufacturing | 311340 Nonchocolate Confectionery Manufacturing | 1,000 employees |
| Hard coal (i.e., anthracite) surface mining | 212113 Anthracite Mining | 250 employees |
| Hard coal (i.e., anthracite) underground mining | 212113 Anthracite Mining | 250 employees |
| Hard disk drives manufacturing | 334112 Computer Storage Device Manufacturing | 1,250 employees |
| Hard drive media manufacturing | 334613 Blank Magnetic and Optical Recording Media Manufacturing | 1,000 employees |
| Hard fiber fabrics, broadwoven, weaving | 313210 Broadwoven Fabric Mills | 1,000 employees |
| Hard fiber spun yarns made from purchased fiber | 313110 Fiber, Yarn, and Thread Mills | 1,250 employees |
| Hard fiber thread manufacturing | 313110 Fiber, Yarn, and Thread Mills | 1,250 employees |
| Hard fiber, narrow woven, weaving | 313220 Narrow Fabric Mills and Schiffli Machine Embroidery | 550 employees |
| Hard hats manufacturing | 339113 Surgical Appliance and Supplies Manufacturing | 800 employees |
| Hardboard manufacturing | 321219 Reconstituted Wood Product Manufacturing | 750 employees |
| Hardening (i.e., heat treating) metals and metal products for the trade | 332811 Metal Heat Treating | 750 employees |
| Hardness testing equipment manufacturing | 334519 Other Measuring and Controlling Device Manufacturing | 600 employees |
| Hardware (except motor vehicle) merchant wholesalers | 423710 Hardware Merchant Wholesalers | 150 employees |
| Hardware cloth, woven wire, made from purchased wire | 332618 Other Fabricated Wire Product Manufacturing | 500 employees |
| Hardware stores | 444130 Hardware Stores | $14.5 million in average annual receipts |
| Hardware, motor vehicle, merchant wholesalers | 423120 Motor Vehicle Supplies and New Parts Merchant Wholesalers | 200 employees |
| Hardware, plastics, manufacturing | 326199 All Other Plastics Product Manufacturing | 750 employees |
| Hardware, transmission pole and line, manufacturing | 335932 Noncurrent-Carrying Wiring Device Manufacturing | 1,000 employees |
| Hardware, transmission pole and line, merchant wholesalers | 423610 Electrical Apparatus and Equipment, Wiring Supplies, and Related Equipment Merchant Wholesalers | 200 employees |
| Hardwood dimension lumber and stock, resawing purchased lumber | 321912 Cut Stock, Resawing Lumber, and Planing | 500 employees |
| Hardwood distillates manufacturing | 325194 Cyclic Crude, Intermediate, and Gum and Wood Chemical Manufacturing | 1,250 employees |
| Hardwood flooring dealers | 444190 Other Building Material Dealers | $22 million in average annual receipts |
| Hardwood flooring, installation only | 238330 Flooring Contractors | $19 million in average annual receipts |
| Hardwood plywood composites manufacturing | 321211 Hardwood Veneer and Plywood Manufacturing | 600 employees |
| Hardwood veneer or plywood manufacturing | 321211 Hardwood Veneer and Plywood Manufacturing | 600 employees |
| Harmonicas manufacturing | 339992 Musical Instrument Manufacturing | 1,000 employees |
| Harness assemblies for electronic use manufacturing | 334419 Other Electronic Component Manufacturing | 750 employees |
| Harness drivers | 711219 Other Spectator Sports | $16.5 million in average annual receipts |
| Harness equipment merchant wholesalers | 424910 Farm Supplies Merchant Wholesalers | 200 employees |
| Harness leather manufacturing | 316110 Leather and Hide Tanning and Finishing | 800 employees |
| Harness parts, metal, manufacturing | 332999 All Other Miscellaneous Fabricated Metal Product Manufacturing | 750 employees |
| Harness racetracks | 711212 Racetracks | $47 million in average annual receipts |
| Harnesses and harness parts, leather, manufacturing | 316998 All Other Leather Good and Allied Product Manufacturing | 500 employees |
| Harnesses, dog, manufacturing | 316998 All Other Leather Good and Allied Product Manufacturing | 500 employees |
| Harps and parts manufacturing | 339992 Musical Instrument Manufacturing | 1,000 employees |
| Harpsichords manufacturing | 339992 Musical Instrument Manufacturing | 1,000 employees |
| Harrows (e.g., disc, spring, tine) manufacturing | 333111 Farm Machinery and Equipment Manufacturing | 1,250 employees |
| Harvest hats, straw, manufacturing | 315990 Apparel Accessories and Other Apparel Manufacturing | 600 employees |
| Harvesting berries or nuts from native and non-cultivated plants | 113210 Forest Nurseries and Gathering of Forest Products | $20.5 million in average annual receipts |
| Harvesting machinery and equipment, agriculture, manufacturing | 333111 Farm Machinery and Equipment Manufacturing | 1,250 employees |
| Harvesting machinery and equipment, agriculture, merchant wholesalers | 423820 Farm and Garden Machinery and Equipment Merchant Wholesalers | 125 employees |
| Hassock fans, electric, manufacturing | 335210 Small Electrical Appliance Manufacturing | 1,500 employees |
| Hat and cap stores | 448150 Clothing Accessories Stores | $29.5 million in average annual receipts |
| Hat blocks manufacturing | 339999 All Other Miscellaneous Manufacturing | 550 employees |
| Hat bodies (e.g., fur-felt, straw, wool-felt) cut and sew apparel contractors | 315210 Cut and Sew Apparel Contractors | 750 employees |
| Hat bodies (e.g., fur-felt, straw, wool-felt) cut and sewn from purchased fabric (except apparel contractors) | 315990 Apparel Accessories and Other Apparel Manufacturing | 600 employees |
| Hat bodies (e.g., fur-felt, straw, wool-felt), men's and boys', cut and sew apparel contractors | 315211 Men's and Boys' Cut and Sew Apparel Contractors | — |
| Hat bodies (e.g., fur-felt, straw, wool-felt), women's, girls', and infants', cut and sew apparel contractors | 315212 Women's, Girls', and Infants' Cut and Sew Apparel Contractors | — |
| Hat cleaning services | 812320 Drycleaning and Laundry Services (except Coin-Operated) | $8 million in average annual receipts |
| Hat findings cut and sew apparel contractors | 315210 Cut and Sew Apparel Contractors | 750 employees |
| Hat findings cut and sewn from purchased fabric (except apparel contractors) | 315990 Apparel Accessories and Other Apparel Manufacturing | 600 employees |
| Hat findings, men's and boys', cut and sew apparel contractors | 315211 Men's and Boys' Cut and Sew Apparel Contractors | — |
| Hat findings, women's, girls', and infants', cut and sew apparel contractors | 315212 Women's, Girls', and Infants' Cut and Sew Apparel Contractors | — |
| Hat linings and trimmings cut and sew apparel contractors | 315210 Cut and Sew Apparel Contractors | 750 employees |
| Hat linings and trimmings cut and sewn from purchased fabric (except apparel contractors) | 315990 Apparel Accessories and Other Apparel Manufacturing | 600 employees |
| Hat linings and trimmings, men's and boys', cut and sew apparel contractors | 315211 Men's and Boys' Cut and Sew Apparel Contractors | — |
| Hat linings and trimmings, women's, girls', and infants', cut and sew apparel contractors | 315212 Women's, Girls', and Infants' Cut and Sew Apparel Contractors | — |
| Hatcheries, finfish | 112511 Finfish Farming and Fish Hatcheries | $3.8 million in average annual receipts |
| Hatcheries, poultry | 112340 Poultry Hatcheries | $4 million in average annual receipts |
| Hatcheries, shellfish | 112512 Shellfish Farming | $3.8 million in average annual receipts |
| Hatchery construction | 236220 Commercial and Institutional Building Construction | $45 million in average annual receipts |
| Hatchets manufacturing | 332216 Saw Blade and Handtool Manufacturing | 750 employees |
| Hats (e.g., cloth, fur, fur-felt, leather, straw, wool-felt) cut and sew apparel contractors | 315210 Cut and Sew Apparel Contractors | 750 employees |
| Hats (except fur, knitting mill products, leather) cut and sewn from purchased fabric (except apparel contractors) | 315990 Apparel Accessories and Other Apparel Manufacturing | 600 employees |
| Hats and caps, men's and boys', merchant wholesalers | 424320 Men's and Boys' Clothing and Furnishings Merchant Wholesalers | 150 employees |
| Hats and caps, women's, girls' and infants', merchant wholesalers | 424330 Women's, Children's, and Infants' Clothing and Accessories Merchant Wholesalers | 100 employees |
| Hats made from purchased paper | 322299 All Other Converted Paper Product Manufacturing | 500 employees |
| Hats made in apparel knitting mills | 315190 Other Apparel Knitting Mills | 750 employees |
| Hats, cloth, cut and sewn from purchased fabric (except apparel contractors) | 315990 Apparel Accessories and Other Apparel Manufacturing | 600 employees |
| Hats, cloth, men's and boys', cut and sew apparel contractors | 315211 Men's and Boys' Cut and Sew Apparel Contractors | — |
| Hats, cloth, women's, girls', and infants', cut and sew apparel contractors | 315212 Women's, Girls', and Infants' Cut and Sew Apparel Contractors | — |
| Hats, fur (except apparel contractors), manufacturing | 315280 Other Cut and Sew Apparel Manufacturing | 750 employees |
| Hats, fur, men's and boys', cut and sew apparel contractors | 315211 Men's and Boys' Cut and Sew Apparel Contractors | — |
| Hats, fur, women's, girls', and infants', cut and sew apparel contractors | 315212 Women's, Girls', and Infants' Cut and Sew Apparel Contractors | — |
| Hats, fur-felt, straw, and wool-felt, cut and sewn from purchased fabric (except apparel contractors) | 315990 Apparel Accessories and Other Apparel Manufacturing | 600 employees |
| Hats, fur-felt, straw, and wool-felt, men's and boys', cut and sew apparel contractors | 315211 Men's and Boys' Cut and Sew Apparel Contractors | — |
| Hats, fur-felt, straw, and wool-felt, women's, girls', and infants', cut and sew apparel contractors | 315212 Women's, Girls', and Infants' Cut and Sew Apparel Contractors | — |
| Hats, leather (except apparel contractors), manufacturing | 315280 Other Cut and Sew Apparel Manufacturing | 750 employees |
| Hats, leather, men's and boys', cut and sew apparel contractors | 315211 Men's and Boys' Cut and Sew Apparel Contractors | — |
| Hats, leather, women's, girls', and infants', cut and sew apparel contractors | 315212 Women's, Girls', and Infants' Cut and Sew Apparel Contractors | — |
| Hats, men's and boys', cut and sew apparel contractors | 315211 Men's and Boys' Cut and Sew Apparel Contractors | — |
| Hats, trimmed, cut and sew apparel contractors | 315210 Cut and Sew Apparel Contractors | 750 employees |
| Hats, trimmed, cut and sewn from purchased fabric (except apparel contractors) | 315990 Apparel Accessories and Other Apparel Manufacturing | 600 employees |
| Hats, trimmed, men's and boys', cut and sew apparel contractors | 315211 Men's and Boys' Cut and Sew Apparel Contractors | — |
| Hats, trimmed, women's, girls', and infants', cut and sew apparel contractors | 315212 Women's, Girls', and Infants' Cut and Sew Apparel Contractors | — |
| Hats, women's, girls', and infants', cut and sew apparel contractors | 315212 Women's, Girls', and Infants' Cut and Sew Apparel Contractors | — |
| Hay balers and presses manufacturing | 333111 Farm Machinery and Equipment Manufacturing | 1,250 employees |
| Hay farming (e.g., alfalfa hay, clover hay, grass hay) | 111940 Hay Farming | $2.5 million in average annual receipts |
| Hay merchant wholesalers | 424910 Farm Supplies Merchant Wholesalers | 200 employees |
| Hay mowing, raking, baling, and chopping | 115113 Crop Harvesting, Primarily by Machine | $13.5 million in average annual receipts |
| Hay seed farming | 111998 All Other Miscellaneous Crop Farming | $2.5 million in average annual receipts |
| Hay, cubed, manufacturing | 311119 Other Animal Food Manufacturing | 650 employees |
| Haying machines manufacturing | 333111 Farm Machinery and Equipment Manufacturing | 1,250 employees |
| Haying machines merchant wholesalers | 423820 Farm and Garden Machinery and Equipment Merchant Wholesalers | 125 employees |
| Hazardous waste collection services | 562112 Hazardous Waste Collection | $47 million in average annual receipts |
| Hazardous waste disposal facilities | 562211 Hazardous Waste Treatment and Disposal | $47 million in average annual receipts |
| Hazardous waste disposal facilities combined with collection and/or local hauling of hazardous waste | 562211 Hazardous Waste Treatment and Disposal | $47 million in average annual receipts |
| Hazardous waste material disposal facilities | 562211 Hazardous Waste Treatment and Disposal | $47 million in average annual receipts |
| Hazardous waste material treatment facilities | 562211 Hazardous Waste Treatment and Disposal | $47 million in average annual receipts |
| Hazardous waste treatment facilities | 562211 Hazardous Waste Treatment and Disposal | $47 million in average annual receipts |
| Hazardous waste treatment facilities combined with collection and/or local hauling of hazardous waste | 562211 Hazardous Waste Treatment and Disposal | $47 million in average annual receipts |
| Hazelnut farming | 111335 Tree Nut Farming | $3.8 million in average annual receipts |
| Head cleaners for magnetic tape equipment, manufacturing | 334613 Blank Magnetic and Optical Recording Media Manufacturing | 1,000 employees |
| Head offices | 551114 Corporate, Subsidiary, and Regional Managing Offices | — |
| Head rice manufacturing | 311212 Rice Milling | 750 employees |
| Head start programs, separate from schools | 624410 Child Care Services | $9.5 million in average annual receipts |
| Headbands cut and sew apparel contractors | 315210 Cut and Sew Apparel Contractors | 750 employees |
| Headbands, women's and girls', cut and sewn from purchased fabric (except apparel contractors) | 315990 Apparel Accessories and Other Apparel Manufacturing | 600 employees |
| Headbands, women's, girls', and infants', cut and sew apparel contractors | 315212 Women's, Girls', and Infants' Cut and Sew Apparel Contractors | — |
| Headboards, wood, manufacturing | 337122 Nonupholstered Wood Household Furniture Manufacturing | 750 employees |
| Heading, barrel (i.e., cooperage stock), wood, manufacturing | 321920 Wood Container and Pallet Manufacturing | 500 employees |
| Heads (e.g., recording, read/write) manufacturing | 334419 Other Electronic Component Manufacturing | 750 employees |
| Heads-up display (HUD) systems, aeronautical, manufacturing | 334511 Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing | 1,350 employees |
| Health and athletic club construction | 236220 Commercial and Institutional Building Construction | $45 million in average annual receipts |
| Health and welfare funds | 525120 Health and Welfare Funds | $40 million in average annual receipts |
| Health club facilities, physical fitness | 713940 Fitness and Recreational Sports Centers | $17.5 million in average annual receipts |
| Health foods (except fresh fruits, vegetables) merchant wholesalers | 424490 Other Grocery and Related Products Merchant Wholesalers | 250 employees |
| Health foods, fresh fruits and vegetables, merchant wholesalers | 424480 Fresh Fruit and Vegetable Merchant Wholesalers | 100 employees |
| Health insurance carriers, direct | 524114 Direct Health and Medical Insurance Carriers | $47 million in average annual receipts |
| Health lamp bulbs, infrared and ultraviolet radiation, manufacturing | 335110 Electric Lamp Bulb and Part Manufacturing | 1,250 employees |
| Health maintenance organization (HMO) medical centers and clinics | 621491 HMO Medical Centers | $44.5 million in average annual receipts |
| Health planning and development agencies, government | 923120 Administration of Public Health Programs | — |
| Health professionals' associations | 813920 Professional Organizations | $23.5 million in average annual receipts |
| Health professions licensure agencies | 926150 Regulation, Licensing, and Inspection of Miscellaneous Commercial Sectors | — |
| Health program administration | 923120 Administration of Public Health Programs | — |
| Health research and development laboratories or services (except biotechnology research and development) | 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) | 1,000 employees |
| Health research fundraising organizations | 813212 Voluntary Health Organizations | $34 million in average annual receipts |
| Health screening services (except by offices of health practitioners) | 621999 All Other Miscellaneous Ambulatory Health Care Services | $20.5 million in average annual receipts |
| Health screening services in physicians' offices | 621111 Offices of Physicians (except Mental Health Specialists) | $16 million in average annual receipts |
| Health spas (i.e., physical fitness facilities) with accommodations | 721110 Hotels (except Casino Hotels) and Motels | $40 million in average annual receipts |
| Health spas without accommodations, physical fitness | 713940 Fitness and Recreational Sports Centers | $17.5 million in average annual receipts |
| Health statistics centers, government | 923120 Administration of Public Health Programs | — |
| Health studios, physical fitness | 713940 Fitness and Recreational Sports Centers | $17.5 million in average annual receipts |
| Hearing aid stores | 446199 All Other Health and Personal Care Stores | $8.5 million in average annual receipts |
| Hearing aids merchant wholesalers | 423450 Medical, Dental, and Hospital Equipment and Supplies Merchant Wholesalers | 200 employees |
| Hearing aids, electronic, manufacturing | 334510 Electromedical and Electrotherapeutic Apparatus Manufacturing | 1,250 employees |
| Hearing testing services (except by offices of audiologists) | 621999 All Other Miscellaneous Ambulatory Health Care Services | $20.5 million in average annual receipts |
| Hearing testing services by offices of audiologists | 621340 Offices of Physical, Occupational and Speech Therapists, and Audiologists | $12.5 million in average annual receipts |
| Hearse bodies manufacturing | 336211 Motor Vehicle Body Manufacturing | 1,000 employees |
| Hearse rental | 532111 Passenger Car Rental | $47 million in average annual receipts |
| Hearse rental with driver | 485320 Limousine Service | $19 million in average annual receipts |
| Hearses assembling on chassis of own manufacture | 336111 Automobile Manufacturing | 1,500 employees |
| Hearses assembling on purchased chassis | 336211 Motor Vehicle Body Manufacturing | 1,000 employees |
| Heart-lung machine, manufacturing | 334510 Electromedical and Electrotherapeutic Apparatus Manufacturing | 1,250 employees |
| Heat exchangers manufacturing | 332410 Power Boiler and Heat Exchanger Manufacturing | 750 employees |
| Heat pump installation | 238220 Plumbing, Heating, and Air-Conditioning Contractors | $19 million in average annual receipts |
| Heat pumps manufacturing | 333415 Air-Conditioning and Warm Air Heating Equipment and Commercial and Industrial Refrigeration Equipment Manufacturing | 1,250 employees |
| Heat pumps merchant wholesalers | 423730 Warm Air Heating and Air-Conditioning Equipment and Supplies Merchant Wholesalers | 175 employees |
| Heat sensitized (i.e., thermal) paper made from purchased paper | 325992 Photographic Film, Paper, Plate, Chemical, and Copy Toner Manufacturing | 1,500 employees |
| Heat shields, carbon or graphite, manufacturing | 335991 Carbon and Graphite Product Manufacturing | 900 employees |
| Heat treating metals and metal products for the trade | 332811 Metal Heat Treating | 750 employees |
| Heat treating ovens, industrial process-type, manufacturing | 333994 Industrial Process Furnace and Oven Manufacturing | 500 employees |
| Heat, steam, distribution | 221330 Steam and Air-Conditioning Supply | $30 million in average annual receipts |
| Heated air distribution | 221330 Steam and Air-Conditioning Supply | $30 million in average annual receipts |
| Heaters, portable electric space, manufacturing | 335210 Small Electrical Appliance Manufacturing | 1,500 employees |
| Heaters, portable electric, merchant wholesalers | 423620 Household Appliances, Electric Housewares, and Consumer Electronics Merchant Wholesalers | 225 employees |
| Heaters, space (except portable electric), manufacturing | 333414 Heating Equipment (except Warm Air Furnaces) Manufacturing | 500 employees |
| Heaters, swimming pool, manufacturing | 333414 Heating Equipment (except Warm Air Furnaces) Manufacturing | 500 employees |
| Heaters, tape, manufacturing | 335210 Small Electrical Appliance Manufacturing | 1,500 employees |
| Heating and air conditioning combination units manufacturing | 333415 Air-Conditioning and Warm Air Heating Equipment and Commercial and Industrial Refrigeration Equipment Manufacturing | 1,250 employees |
| Heating and cooling duct work installation | 238220 Plumbing, Heating, and Air-Conditioning Contractors | $19 million in average annual receipts |
| Heating and cooling system controls, residential and commercial, manufacturing | 334512 Automatic Environmental Control Manufacturing for Residential, Commercial, and Appliance Use | 650 employees |
| Heating and ventilation system component (e.g., air registers, diffusers, filters, grilles, sound attenuators) installation | 238220 Plumbing, Heating, and Air-Conditioning Contractors | $19 million in average annual receipts |
| Heating boiler installation | 238220 Plumbing, Heating, and Air-Conditioning Contractors | $19 million in average annual receipts |
| Heating boilers, steam and hot water, merchant wholesalers | 423720 Plumbing and Heating Equipment and Supplies (Hydronics) Merchant Wholesalers | 200 employees |
| Heating contractors | 238220 Plumbing, Heating, and Air-Conditioning Contractors | $19 million in average annual receipts |
| Heating engineering consulting services | 541330 Engineering Services | $25.5 million in average annual receipts |
| Heating equipment installation | 238220 Plumbing, Heating, and Air-Conditioning Contractors | $19 million in average annual receipts |
| Heating equipment, hot water (except hot water heaters), manufacturing | 333414 Heating Equipment (except Warm Air Furnaces) Manufacturing | 500 employees |
| Heating equipment, hot water, merchant wholesalers | 423720 Plumbing and Heating Equipment and Supplies (Hydronics) Merchant Wholesalers | 200 employees |
| Heating equipment, warm air (i.e. forced air), merchant wholesalers | 423730 Warm Air Heating and Air-Conditioning Equipment and Supplies Merchant Wholesalers | 175 employees |
| Heating equipment, warm air (i.e., forced air), manufacturing | 333415 Air-Conditioning and Warm Air Heating Equipment and Commercial and Industrial Refrigeration Equipment Manufacturing | 1,250 employees |
| Heating oil dealers, direct selling | 454310 Fuel Dealers | 100 employees |
| Heating oils made in petroleum refineries | 324110 Petroleum Refineries | 1,500 employees |
| Heating pads, electric, manufacturing | 335210 Small Electrical Appliance Manufacturing | 1,500 employees |
| Heating regulators manufacturing | 334512 Automatic Environmental Control Manufacturing for Residential, Commercial, and Appliance Use | 650 employees |
| Heating steam (suppliers of heat) providers | 221330 Steam and Air-Conditioning Supply | $30 million in average annual receipts |
| Heating units for electric appliances manufacturing | 335210 Small Electrical Appliance Manufacturing | 1,500 employees |
| Heating units, baseboard, manufacturing | 333414 Heating Equipment (except Warm Air Furnaces) Manufacturing | 500 employees |
| Heating, ventilation and air-conditioning (HVAC) contractors | 238220 Plumbing, Heating, and Air-Conditioning Contractors | $19 million in average annual receipts |
| Heavy construction equipment rental without operator | 532412 Construction, Mining, and Forestry Machinery and Equipment Rental and Leasing | $40 million in average annual receipts |
| Heavy equipment operation schools | 611519 Other Technical and Trade Schools | $21 million in average annual receipts |
| Heavy equipment repair training | 611519 Other Technical and Trade Schools | $21 million in average annual receipts |
| Heavy machinery and equipment repair and maintenance services | 811310 Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance | $12.5 million in average annual receipts |
| Heavy trucks assembling on chassis of own manufacture | 336120 Heavy Duty Truck Manufacturing | 1,500 employees |
| Heavy trucks assembling on purchased chassis | 336211 Motor Vehicle Body Manufacturing | 1,000 employees |
| Heavy water (i.e., deuterium oxide) manufacturing | 325180 Other Basic Inorganic Chemical Manufacturing | 1,000 employees |
| Hedge shears and trimmers, nonelectric, manufacturing | 332216 Saw Blade and Handtool Manufacturing | 750 employees |
| Hedge trimmers, powered, manufacturing | 333112 Lawn and Garden Tractor and Home Lawn and Garden Equipment Manufacturing | 1,500 employees |
| Heel caps, leather or metal, manufacturing | 316998 All Other Leather Good and Allied Product Manufacturing | 500 employees |
| Heel lifts, leather, manufacturing | 316998 All Other Leather Good and Allied Product Manufacturing | 500 employees |
| Heels, boot and shoe, finished wood, manufacturing | 321999 All Other Miscellaneous Wood Product Manufacturing | 500 employees |
| Heels, boot and shoe, leather, manufacturing | 316998 All Other Leather Good and Allied Product Manufacturing | 500 employees |
| Helical springs, hot wound heavy gauge metal, manufacturing | 332613 Spring Manufacturing | 600 employees |
| Helical springs, light gauge, made from purchased wire or strip, manufacturing | 332613 Spring Manufacturing | 600 employees |
| Helicopter carriers, freight, nonscheduled | 481212 Nonscheduled Chartered Freight Air Transportation | 1,500 employees |
| Helicopter freight carriers, scheduled | 481112 Scheduled Freight Air Transportation | 1,500 employees |
| Helicopter passenger carriers (except scenic, sightseeing), nonscheduled | 481211 Nonscheduled Chartered Passenger Air Transportation | 1,500 employees |
| Helicopter passenger carriers, scheduled | 481111 Scheduled Passenger Air Transportation | 1,500 employees |
| Helicopter ride, scenic and sightseeing, operation | 487990 Scenic and Sightseeing Transportation, Other | $25 million in average annual receipts |
| Helicopters manufacturing | 336411 Aircraft Manufacturing | 1,500 employees |
| Helium manufacturing | 325120 Industrial Gas Manufacturing | 1,200 employees |
| Helium recovery from natural gas | 325120 Industrial Gas Manufacturing | 1,200 employees |
| Helmets (except athletic), safety (e.g., motorized vehicle crash helmets, space helmets), manufacturing | 339113 Surgical Appliance and Supplies Manufacturing | 800 employees |
| Helmets, athletic (except motorized vehicle crash helmets), manufacturing | 339920 Sporting and Athletic Goods Manufacturing | 750 employees |
| Help supply services | 561320 Temporary Help Services | $34 million in average annual receipts |
| Hematite mining and/or beneficiating | 212210 Iron Ore Mining | 1,400 employees |
| Hematology in-vitro diagnostic substances manufacturing | 325413 In-Vitro Diagnostic Substance Manufacturing | 1,250 employees |
| Hematology in-vivo diagnostic substances manufacturing | 325412 Pharmaceutical Preparation Manufacturing | 1,300 employees |
| Hematology instruments manufacturing | 334516 Analytical Laboratory Instrument Manufacturing | 1,000 employees |
| Hematology products (except diagnostic substances) manufacturing | 325414 Biological Product (except Diagnostic) Manufacturing | 1,250 employees |
| Hemlock extract manufacturing | 325194 Cyclic Crude, Intermediate, and Gum and Wood Chemical Manufacturing | 1,250 employees |
| Hemlock gum gathering | 113210 Forest Nurseries and Gathering of Forest Products | $20.5 million in average annual receipts |
| Hemodialysis centers and clinics | 621492 Kidney Dialysis Centers | $47 million in average annual receipts |
| Hemp bags made from purchased fiber | 313110 Fiber, Yarn, and Thread Mills | 1,250 employees |
| Hemp ropes made from purchased fiber | 313110 Fiber, Yarn, and Thread Mills | 1,250 employees |
| Hemp spun yarns made from purchased fiber | 313110 Fiber, Yarn, and Thread Mills | 1,250 employees |
| Hemstitching apparel contractors on apparel | 315210 Cut and Sew Apparel Contractors | 750 employees |
| Hemstitching apparel contractors on men's and boys' apparel | 315211 Men's and Boys' Cut and Sew Apparel Contractors | — |
| Hemstitching apparel contractors on women's, girls', and infants' apparel | 315212 Women's, Girls', and Infants' Cut and Sew Apparel Contractors | — |
| Heptanes made from refined petroleum or liquid hydrocarbons | 325110 Petrochemical Manufacturing | 1,300 employees |
| Heptenes made from refined petroleum or liquid hydrocarbons | 325110 Petrochemical Manufacturing | 1,300 employees |
| Herb farming, grown under cover | 111419 Other Food Crops Grown Under Cover | $4.5 million in average annual receipts |
| Herb farming, open field | 111998 All Other Miscellaneous Crop Farming | $2.5 million in average annual receipts |
| Herbaceous perennial growing | 111421 Nursery and Tree Production | $3.3 million in average annual receipts |
| Herbal supplement stores | 446191 Food (Health) Supplement Stores | $20 million in average annual receipts |
| Herbal supplements manufacturing | 325411 Medicinal and Botanical Manufacturing | 1,000 employees |
| Herbal supplements merchant wholesalers | 424210 Drugs and Druggists' Sundries Merchant Wholesalers | 250 employees |
| Herbalists' offices (e.g., centers, clinics) | 621399 Offices of All Other Miscellaneous Health Practitioners | $10 million in average annual receipts |
| Herbariums | 712110 Museums | $34 million in average annual receipts |
| Herbicides manufacturing | 325320 Pesticide and Other Agricultural Chemical Manufacturing | 1,150 employees |
| Heritage festival managers with facilities | 711310 Promoters of Performing Arts, Sports, and Similar Events with Facilities | $40 million in average annual receipts |
| Heritage festival managers without facilities | 711320 Promoters of Performing Arts, Sports, and Similar Events without Facilities | $22 million in average annual receipts |
| Heritage festival organizers with facilities | 711310 Promoters of Performing Arts, Sports, and Similar Events with Facilities | $40 million in average annual receipts |
| Heritage festival organizers without facilities | 711320 Promoters of Performing Arts, Sports, and Similar Events without Facilities | $22 million in average annual receipts |
| Heritage festival promoters with facilities | 711310 Promoters of Performing Arts, Sports, and Similar Events with Facilities | $40 million in average annual receipts |
| Heritage festival promoters without facilities | 711320 Promoters of Performing Arts, Sports, and Similar Events without Facilities | $22 million in average annual receipts |
| Heritage villages | 712120 Historical Sites | $13 million in average annual receipts |
| Hermetically sealed window unit, commercial type, installation | 238150 Glass and Glazing Contractors | $19 million in average annual receipts |
| Hermetically sealed window unit, residential-type, installation | 238350 Finish Carpentry Contractors | $19 million in average annual receipts |
| Herring fishing | 114111 Finfish Fishing | $25 million in average annual receipts |
| Heterocyclic chemicals, not specified elsewhere by process, manufacturing | 325199 All Other Basic Organic Chemical Manufacturing | 1,250 employees |
| Hexadecanol manufacturing | 325199 All Other Basic Organic Chemical Manufacturing | 1,250 employees |
| Hexamethylenediamine manufacturing | 325199 All Other Basic Organic Chemical Manufacturing | 1,250 employees |
| Hexamethylenetetramine manufacturing | 325199 All Other Basic Organic Chemical Manufacturing | 1,250 employees |
| Hexanol manufacturing | 325199 All Other Basic Organic Chemical Manufacturing | 1,250 employees |
| HFCS (high fructose corn syrup) manufacturing | 311221 Wet Corn Milling and Starch Manufacturing | 1,300 employees |
| Hides and skins produced in slaughtering plants | 311611 Animal (except Poultry) Slaughtering | 1,150 employees |
| Hides and skins, finishing on a contract basis | 316110 Leather and Hide Tanning and Finishing | 800 employees |
| Hides merchant wholesalers | 424590 Other Farm Product Raw Material Merchant Wholesalers | 175 employees |
| Hides, tanning, currying, dressing, and finishing | 316110 Leather and Hide Tanning and Finishing | 800 employees |
| High chairs, wood, children's, manufacturing | 337122 Nonupholstered Wood Household Furniture Manufacturing | 750 employees |
| High fructose corn syrup (HFCS) manufacturing | 311221 Wet Corn Milling and Starch Manufacturing | 1,300 employees |
| High intensity lamp bulbs manufacturing | 335110 Electric Lamp Bulb and Part Manufacturing | 1,250 employees |
| High percentage nonferrous alloying elements (i.e., ferroalloys) manufacturing | 331110 Iron and Steel Mills and Ferroalloy Manufacturing | 1,500 employees |
| High schools | 611110 Elementary and Secondary Schools | $20 million in average annual receipts |
| High schools offering both academic and technical courses | 611110 Elementary and Secondary Schools | $20 million in average annual receipts |
| High schools offering both academic and vocational courses | 611110 Elementary and Secondary Schools | $20 million in average annual receipts |
| High-rise apartment construction general contractors | 236116 New Multifamily Housing Construction (except For-Sale Builders) | $45 million in average annual receipts |
| High-rise apartment for-sale builders | 236117 New Housing For-Sale Builders | $45 million in average annual receipts |
| Highway bridge sections, prefabricated metal, manufacturing | 332312 Fabricated Structural Metal Manufacturing | 500 employees |
| Highway construction | 237310 Highway, Street, and Bridge Construction | $45 million in average annual receipts |
| Highway guardrails, sheet metal (except stampings), manufacturing | 332322 Sheet Metal Work Manufacturing | 500 employees |
| Highway line marking machinery manufacturing | 333120 Construction Machinery Manufacturing | 1,250 employees |
| Highway line painting | 237310 Highway, Street, and Bridge Construction | $45 million in average annual receipts |
| Highway patrols, police | 922120 Police Protection | — |
| Highway tractors assembled on chassis of own manufacture | 336120 Heavy Duty Truck Manufacturing | 1,500 employees |
| Highway tractors assembling on purchased chassis | 336211 Motor Vehicle Body Manufacturing | 1,000 employees |
| Highway, street and bridge lighting and electrical signal installation | 238210 Electrical Contractors and Other Wiring Installation Contractors | $19 million in average annual receipts |
| Hinges, metal, manufacturing | 332510 Hardware Manufacturing | 750 employees |
| Historic and cultural preservation research and development services | 541720 Research and Development in the Social Sciences and Humanities | $28 million in average annual receipts |
| Historical clubs | 813410 Civic and Social Organizations | $9.5 million in average annual receipts |
| Historical forts | 712120 Historical Sites | $13 million in average annual receipts |
| Historical museums | 712110 Museums | $34 million in average annual receipts |
| Historical ships | 712120 Historical Sites | $13 million in average annual receipts |
| Historical sites | 712120 Historical Sites | $13 million in average annual receipts |
| Hitches, trailer, automotive, truck, and bus, manufacturing | 336390 Other Motor Vehicle Parts Manufacturing | 1,000 employees |
| HIV test kits manufacturing | 325413 In-Vitro Diagnostic Substance Manufacturing | 1,250 employees |
| HMO (health maintenance organization) medical centers and clinics | 621491 HMO Medical Centers | $44.5 million in average annual receipts |
| Hobby shops | 451120 Hobby, Toy, and Game Stores | $31 million in average annual receipts |
| Hobbyhorses manufacturing | 339930 Doll, Toy, and Game Manufacturing | 700 employees |
| Hobbyists' supplies merchant wholesalers | 423920 Toy and Hobby Goods and Supplies Merchant Wholesalers | 175 employees |
| Hobs (i.e., metal gear cutting tool) manufacturing | 333515 Cutting Tool and Machine Tool Accessory Manufacturing | 500 employees |
| Hockey clubs, professional or semiprofessional | 711211 Sports Teams and Clubs | $47 million in average annual receipts |
| Hockey clubs, recreational | 713990 All Other Amusement and Recreation Industries | $9 million in average annual receipts |
| Hockey equipment (except apparel) manufacturing | 339920 Sporting and Athletic Goods Manufacturing | 750 employees |
| Hockey equipment and supplies merchant wholesalers | 423910 Sporting and Recreational Goods and Supplies Merchant Wholesalers | 100 employees |
| Hockey instruction, camps, or schools | 611620 Sports and Recreation Instruction | $9 million in average annual receipts |
| Hockey skates manufacturing | 339920 Sporting and Athletic Goods Manufacturing | 750 employees |
| Hockey teams, professional or semiprofessional | 711211 Sports Teams and Clubs | $47 million in average annual receipts |
| Hockey teams, recreational | 713990 All Other Amusement and Recreation Industries | $9 million in average annual receipts |
| Hoeing | 115112 Soil Preparation, Planting, and Cultivating | $9.5 million in average annual receipts |
| Hoes, garden and mason's handtools, manufacturing | 332216 Saw Blade and Handtool Manufacturing | 750 employees |
| Hog and pig (including breeding, farrowing, nursery, and finishing activities) farming | 112210 Hog and Pig Farming | $4 million in average annual receipts |
| Hog feeding and watering equipment manufacturing | 333111 Farm Machinery and Equipment Manufacturing | 1,250 employees |
| Hog feedlots (except stockyards for transportation) | 112210 Hog and Pig Farming | $4 million in average annual receipts |
| Hogs merchant wholesalers | 424520 Livestock Merchant Wholesalers | 125 employees |
| Hogsheads, coopered wood, manufacturing | 321920 Wood Container and Pallet Manufacturing | 500 employees |
| Hoisting and placement of large-scale apparatus | 238290 Other Building Equipment Contractors | $22 million in average annual receipts |
| Hoists (except aircraft loading) manufacturing | 333923 Overhead Traveling Crane, Hoist, and Monorail System Manufacturing | 1,250 employees |
| Hoists (except automotive) merchant wholesalers | 423830 Industrial Machinery and Equipment Merchant Wholesalers | 100 employees |
| Hoists, aircraft loading, manufacturing | 333924 Industrial Truck, Tractor, Trailer, and Stacker Machinery Manufacturing | 900 employees |
| Hoists, automotive, merchant wholesalers | 423120 Motor Vehicle Supplies and New Parts Merchant Wholesalers | 200 employees |
| Holding companies (except bank, managing) | 551112 Offices of Other Holding Companies | $45.5 million in average annual receipts |
| Holding companies that manage | 551114 Corporate, Subsidiary, and Regional Managing Offices | — |
| Holding companies, bank (except managing) | 551111 Offices of Bank Holding Companies | $38.5 million in average annual receipts |
| Holepunchers (except hand operated), office-type, manufacturing | 333318 Other Commercial and Service Industry Machinery Manufacturing | 1,000 employees |
| Holepunchers, hand operated, manufacturing | 339940 Office Supplies (except Paper) Manufacturing | 750 employees |
| Hollowware, precious metal, manufacturing | 339910 Jewelry and Silverware Manufacturing | 700 employees |
| Hollowware, precious plated metal, manufacturing | 332999 All Other Miscellaneous Fabricated Metal Product Manufacturing | 750 employees |
| Holsters, leather, manufacturing | 316998 All Other Leather Good and Allied Product Manufacturing | 500 employees |
| Home and auto supply stores | 452319 All Other General Merchandise Stores | $35 million in average annual receipts |
| Home and garden equipment rental centers | 532310 General Rental Centers | $9 million in average annual receipts |
| Home automation system installation | 238210 Electrical Contractors and Other Wiring Installation Contractors | $19 million in average annual receipts |
| Home builders (except for-sale), multifamily | 236116 New Multifamily Housing Construction (except For-Sale Builders) | $45 million in average annual receipts |
| Home builders (except for-sale), single-family | 236115 New Single-Family Housing Construction (except For-Sale Builders) | $45 million in average annual receipts |
| Home builders, for-sale | 236117 New Housing For-Sale Builders | $45 million in average annual receipts |
| Home canning lids and rings, metal stamping | 332119 Metal Crown, Closure, and Other Metal Stamping (except Automotive) | 500 employees |
| Home care of elderly, medical | 621610 Home Health Care Services | $19 million in average annual receipts |
| Home care of elderly, non-medical | 624120 Services for the Elderly and Persons with Disabilities | $15 million in average annual receipts |
| Home centers, building materials | 444110 Home Centers | $47 million in average annual receipts |
| Home construction organizations, work (sweat) equity | 624229 Other Community Housing Services | $19 million in average annual receipts |
| Home delivery newspaper routes, direct selling | 454390 Other Direct Selling Establishments | $13 million in average annual receipts |
| Home entertainment centers, metal, manufacturing | 337124 Metal Household Furniture Manufacturing | 750 employees |
| Home entertainment centers, wood, manufacturing | 337122 Nonupholstered Wood Household Furniture Manufacturing | 750 employees |
| Home equity credit lending | 522292 Real Estate Credit | $47 million in average annual receipts |
| Home health agencies | 621610 Home Health Care Services | $19 million in average annual receipts |
| Home health aid schools | 611519 Other Technical and Trade Schools | $21 million in average annual receipts |
| Home health care agencies | 621610 Home Health Care Services | $19 million in average annual receipts |
| Home health furniture and equipment rental | 532283 Home Health Equipment Rental | $41 million in average annual receipts |
| Home improvement (e.g., adding on, remodeling, renovating) | 236118 Residential Remodelers | $45 million in average annual receipts |
| Home improvement (e.g., adding on, remodeling, renovating), multifamily building, for-sale builders | 236118 Residential Remodelers | $45 million in average annual receipts |
| Home improvement (e.g., adding on, remodeling, renovating), multifamily building, general contractors | 236118 Residential Remodelers | $45 million in average annual receipts |
| Home improvement (e.g., adding on, remodeling, renovating), single-family housing, for-sale builders | 236118 Residential Remodelers | $45 million in average annual receipts |
| Home improvement (e.g., adding on, remodeling, renovating), single-family housing, general contractors | 236118 Residential Remodelers | $45 million in average annual receipts |
| Home improvement centers | 444110 Home Centers | $47 million in average annual receipts |
| Home inspection services | 541350 Building Inspection Services | $11.5 million in average annual receipts |
| Home nursing services (except private practices) | 621610 Home Health Care Services | $19 million in average annual receipts |
| Home nursing services, private practice | 621399 Offices of All Other Miscellaneous Health Practitioners | $10 million in average annual receipts |
| Home renovation | 236118 Residential Remodelers | $45 million in average annual receipts |
| Home security equipment stores | 453998 All Other Miscellaneous Store Retailers (except Tobacco Stores) | $10 million in average annual receipts |
| Home show managers | 561920 Convention and Trade Show Organizers | $20 million in average annual receipts |
| Home show organizers | 561920 Convention and Trade Show Organizers | $20 million in average annual receipts |
| Home show promoters | 561920 Convention and Trade Show Organizers | $20 million in average annual receipts |
| Home stereo systems manufacturing | 334310 Audio and Video Equipment Manufacturing | 750 employees |
| Home tape recorders and players (e.g., cartridge, cassette, reel) manufacturing | 334310 Audio and Video Equipment Manufacturing | 750 employees |
| Home theater audio and video equipment manufacturing | 334310 Audio and Video Equipment Manufacturing | 750 employees |
| Home theater installation | 238210 Electrical Contractors and Other Wiring Installation Contractors | $19 million in average annual receipts |
| Home workshop metal cutting machine tools (except handtools, welding equipment) manufacturing | 333517 Machine Tool Manufacturing | 500 employees |
| Homefurnishings merchant wholesalers | 423220 Home Furnishing Merchant Wholesalers | 100 employees |
| Homefurnishings stores | 442299 All Other Home Furnishings Stores | $29.5 million in average annual receipts |
| Homeless shelters | 624221 Temporary Shelters | $13.5 million in average annual receipts |
| Homemaker's service for elderly or disabled persons, non-medical | 624120 Services for the Elderly and Persons with Disabilities | $15 million in average annual receipts |
| Homeopaths' offices (e.g., centers, clinics) | 621399 Offices of All Other Miscellaneous Health Practitioners | $10 million in average annual receipts |
| Homeowners' associations | 813990 Other Similar Organizations (except Business, Professional, Labor, and Political Organizations) | $13.5 million in average annual receipts |
| Homeowners' associations, condominium | 813990 Other Similar Organizations (except Business, Professional, Labor, and Political Organizations) | $13.5 million in average annual receipts |
| Homeowners' insurance carriers, direct | 524126 Direct Property and Casualty Insurance Carriers | 1,500 employees |
| Homeowners' warranty insurance carriers, direct | 524128 Other Direct Insurance (except Life, Health, and Medical) Carriers | $47 million in average annual receipts |
| Homes for children with health care incidental | 623990 Other Residential Care Facilities | $16 million in average annual receipts |
| Homes for emotionally disturbed adults or children | 623220 Residential Mental Health and Substance Abuse Facilities | $19 million in average annual receipts |
| Homes for the aged with nursing care | 623110 Nursing Care Facilities (Skilled Nursing Facilities) | $34 million in average annual receipts |
| Homes for the aged without nursing care | 623312 Assisted Living Facilities for the Elderly | $23.5 million in average annual receipts |
| Homes for the elderly with nursing care | 623110 Nursing Care Facilities (Skilled Nursing Facilities) | $34 million in average annual receipts |
| Homes for the elderly without nursing care | 623312 Assisted Living Facilities for the Elderly | $23.5 million in average annual receipts |
| Homes for unwed mothers | 623990 Other Residential Care Facilities | $16 million in average annual receipts |
| Homes with or without health care, intellectual and developmental disability | 623210 Residential Intellectual and Developmental Disability Facilities | $19 million in average annual receipts |
| Homes, psychiatric convalescent | 623220 Residential Mental Health and Substance Abuse Facilities | $19 million in average annual receipts |
| Hominy grits (except breakfast food), manufacturing | 311211 Flour Milling | 1,050 employees |
| Hominy grits, prepared as cereal breakfast food, manufacturing | 311230 Breakfast Cereal Manufacturing | 1,300 employees |
| Hominy, canned, manufacturing | 311421 Fruit and Vegetable Canning | 1,000 employees |
| Homogenizing machinery, food, manufacturing | 333241 Food Product Machinery Manufacturing | 500 employees |
| Homogenizing milk | 311511 Fluid Milk Manufacturing | 1,150 employees |
| Hones mining and/or beneficiating | 212399 All Other Nonmetallic Mineral Mining | 500 employees |
| Honey bee production | 112910 Apiculture | $3.3 million in average annual receipts |
| Honey merchant wholesalers | 424490 Other Grocery and Related Products Merchant Wholesalers | 250 employees |
| Honey processing | 311999 All Other Miscellaneous Food Manufacturing | 700 employees |
| Honeydew melon farming, field, bedding plant and seed production | 111219 Other Vegetable (except Potato) and Melon Farming | $3.8 million in average annual receipts |
| Honing and lapping machines, metal cutting type, manufacturing | 333517 Machine Tool Manufacturing | 500 employees |
| Honing heads (i.e., a machine tool accessory) manufacturing | 333515 Cutting Tool and Machine Tool Accessory Manufacturing | 500 employees |
| Honor camps, correctional | 922140 Correctional Institutions | — |
| Hoods, industrial, fabricated metal plate work, manufacturing | 332313 Plate Work Manufacturing | 750 employees |
| Hoods, range (except household-type), sheet metal (except stampings), manufacturing | 332322 Sheet Metal Work Manufacturing | 500 employees |
| Hoods, range, household-type, manufacturing | 335210 Small Electrical Appliance Manufacturing | 1,500 employees |
| Hoof trimming | 115210 Support Activities for Animal Production | $11 million in average annual receipts |
| Hook and eye fasteners (i.e., sewing accessories) manufacturing | 339993 Fastener, Button, Needle, and Pin Manufacturing | 750 employees |
| Hook and eye latches, metal, manufacturing | 332722 Bolt, Nut, Screw, Rivet, and Washer Manufacturing | 600 employees |
| Hook and loop fastener fabric manufacturing | 313220 Narrow Fabric Mills and Schiffli Machine Embroidery | 550 employees |
| Hooks (i.e., general purpose fasteners), metal, manufacturing | 332722 Bolt, Nut, Screw, Rivet, and Washer Manufacturing | 600 employees |
| Hooks, fishing, manufacturing | 339920 Sporting and Athletic Goods Manufacturing | 750 employees |
| Hooks, handtools (e.g., baling, bush, grass, husking), manufacturing | 332216 Saw Blade and Handtool Manufacturing | 750 employees |
| Hooks, metal screw, manufacturing | 332722 Bolt, Nut, Screw, Rivet, and Washer Manufacturing | 600 employees |
| Hoops made in iron and steel mills | 331110 Iron and Steel Mills and Ferroalloy Manufacturing | 1,500 employees |
| Hoops, galvanized, made in iron and steel mills | 331110 Iron and Steel Mills and Ferroalloy Manufacturing | 1,500 employees |
| Hoops, metal (except wire), fabricated from purchased metal | 332999 All Other Miscellaneous Fabricated Metal Product Manufacturing | 750 employees |
| Hoops, sawed or split wood for tight or slack cooperage, manufacturing | 321920 Wood Container and Pallet Manufacturing | 500 employees |
| Hop extract manufacturing | 311942 Spice and Extract Manufacturing | 650 employees |
| Hop extract merchant wholesalers | 424490 Other Grocery and Related Products Merchant Wholesalers | 250 employees |
| Hop farming | 111998 All Other Miscellaneous Crop Farming | $2.5 million in average annual receipts |
| Hopper feed devices (i.e., a machine tool accessory) manufacturing | 333515 Cutting Tool and Machine Tool Accessory Manufacturing | 500 employees |
| Hoppers, fabricated metal plate work, manufacturing | 332313 Plate Work Manufacturing | 750 employees |
| Hoppers, light gauge metal, manufacturing | 332439 Other Metal Container Manufacturing | 600 employees |
| Hops merchant wholesalers | 424590 Other Farm Product Raw Material Merchant Wholesalers | 175 employees |
| Horizon situation instrumentation manufacturing | 334511 Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing | 1,350 employees |
| Horizontal drilling (e.g., underground cable, pipeline, sewer installation) | 237990 Other Heavy and Civil Engineering Construction | $45 million in average annual receipts |
| Hormone in-vitro diagnostic substances manufacturing | 325413 In-Vitro Diagnostic Substance Manufacturing | 1,250 employees |
| Hormone preparations (except in-vitro diagnostics) manufacturing | 325412 Pharmaceutical Preparation Manufacturing | 1,300 employees |
| Hormones and derivatives, uncompounded, manufacturing | 325411 Medicinal and Botanical Manufacturing | 1,000 employees |
| Horse (including thoroughbreds) production | 112920 Horses and Other Equine Production | $2.8 million in average annual receipts |
| Horse bits manufacturing | 332999 All Other Miscellaneous Fabricated Metal Product Manufacturing | 750 employees |
| Horse boots and muzzles manufacturing | 316998 All Other Leather Good and Allied Product Manufacturing | 500 employees |
| Horse racetracks | 711212 Racetracks | $47 million in average annual receipts |
| Horse racing stables | 711219 Other Spectator Sports | $16.5 million in average annual receipts |
| Horse rental services, recreational saddle | 713990 All Other Amusement and Recreation Industries | $9 million in average annual receipts |
| Horse show managers with facilities | 711310 Promoters of Performing Arts, Sports, and Similar Events with Facilities | $40 million in average annual receipts |
| Horse show managers without facilities | 711320 Promoters of Performing Arts, Sports, and Similar Events without Facilities | $22 million in average annual receipts |
| Horse show organizers with facilities | 711310 Promoters of Performing Arts, Sports, and Similar Events with Facilities | $40 million in average annual receipts |
| Horse show organizers without facilities | 711320 Promoters of Performing Arts, Sports, and Similar Events without Facilities | $22 million in average annual receipts |
| Horse show promoters with facilities | 711310 Promoters of Performing Arts, Sports, and Similar Events with Facilities | $40 million in average annual receipts |
| Horse show promoters without facilities | 711320 Promoters of Performing Arts, Sports, and Similar Events without Facilities | $22 million in average annual receipts |
| Horse trailers (except fifth-wheel-type) manufacturing | 336214 Travel Trailer and Camper Manufacturing | 1,000 employees |
| Horse trailers, fifth-wheel-type, manufacturing | 336212 Truck Trailer Manufacturing | 1,000 employees |
| Horse-drawn carriage operation | 487110 Scenic and Sightseeing Transportation, Land | $20.5 million in average annual receipts |
| Horseback riding, recreational | 713990 All Other Amusement and Recreation Industries | $9 million in average annual receipts |
| Horsemeat produced in slaughtering plants | 311611 Animal (except Poultry) Slaughtering | 1,150 employees |
| Horsemeat, processing, for dog and cat food | 311111 Dog and Cat Food Manufacturing | 1,250 employees |
| Horseradish (except sauce) canning | 311421 Fruit and Vegetable Canning | 1,000 employees |
| Horseradish, prepared sauce, manufacturing | 311941 Mayonnaise, Dressing, and Other Prepared Sauce Manufacturing | 850 employees |
| Horses (except racehorses), boarding | 115210 Support Activities for Animal Production | $11 million in average annual receipts |
| Horses merchant wholesalers | 424590 Other Farm Product Raw Material Merchant Wholesalers | 175 employees |
| Horses, training (except racehorses) | 115210 Support Activities for Animal Production | $11 million in average annual receipts |
| Horseshoe nails, iron or steel, made in wire drawing plants | 331222 Steel Wire Drawing | 1,000 employees |
| Horseshoeing | 115210 Support Activities for Animal Production | $11 million in average annual receipts |
| Horseshoes, ferrous forged, made from purchased iron or steel | 332111 Iron and Steel Forging | 750 employees |
| Horticultural consulting services | 541690 Other Scientific and Technical Consulting Services | $19 million in average annual receipts |
| Hose assemblies for fluid power systems manufacturing | 332912 Fluid Power Valve and Hose Fitting Manufacturing | 1,000 employees |
| Hose clamps, metal, manufacturing | 332722 Bolt, Nut, Screw, Rivet, and Washer Manufacturing | 600 employees |
| Hose couplings and fittings, fluid power, manufacturing | 332912 Fluid Power Valve and Hose Fitting Manufacturing | 1,000 employees |
| Hose couplings, metal (except fluid power), manufacturing | 332919 Other Metal Valve and Pipe Fitting Manufacturing | 750 employees |
| Hose fabrics, tubular, weaving | 313220 Narrow Fabric Mills and Schiffli Machine Embroidery | 550 employees |
| Hose, flexible metal, manufacturing | 332999 All Other Miscellaneous Fabricated Metal Product Manufacturing | 750 employees |
| Hose, industrial, merchant wholesalers | 423840 Industrial Supplies Merchant Wholesalers | 125 employees |
| Hoses, reinforced, rubber or plastics, manufacturing | 326220 Rubber and Plastics Hoses and Belting Manufacturing | 800 employees |
| Hoses, rubberized fabric, manufacturing | 326220 Rubber and Plastics Hoses and Belting Manufacturing | 800 employees |
| Hosiery (except sheer), women's, girls' and infants', manufacturing | 315119 Other Hosiery and Sock Mills | — |
| Hosiery machines manufacturing | 333249 Other Industrial Machinery Manufacturing | 500 employees |
| Hosiery stores | 448190 Other Clothing Stores | $27.5 million in average annual receipts |
| Hosiery, men's and boys', merchant wholesalers | 424320 Men's and Boys' Clothing and Furnishings Merchant Wholesalers | 150 employees |
| Hosiery, orthopedic support, manufacturing | 339113 Surgical Appliance and Supplies Manufacturing | 800 employees |
| Hosiery, sheer, women's, misses', and girls' full-length and knee-length, knitting or knitting and finishing | 315110 Hosiery and Sock Mills | 750 employees |
| Hosiery, women's and girls', merchant wholesalers | 424330 Women's, Children's, and Infants' Clothing and Accessories Merchant Wholesalers | 100 employees |
| Hosiery, women's, children's, and infants', merchant wholesalers | 424330 Women's, Children's, and Infants' Clothing and Accessories Merchant Wholesalers | 100 employees |
| Hosiery, women's, girls', and infants', manufacturing | 315110 Hosiery and Sock Mills | 750 employees |
| Hospice care services, in home | 621610 Home Health Care Services | $19 million in average annual receipts |
| Hospices, inpatient care | 623110 Nursing Care Facilities (Skilled Nursing Facilities) | $34 million in average annual receipts |
| Hospital administrators' associations | 813920 Professional Organizations | $23.5 million in average annual receipts |
| Hospital and medical service plans, direct, without providing health care services | 524114 Direct Health and Medical Insurance Carriers | $47 million in average annual receipts |
| Hospital associations | 813910 Business Associations | $15.5 million in average annual receipts |
| Hospital bed rental and leasing (i.e. home use) | 532283 Home Health Equipment Rental | $41 million in average annual receipts |
| Hospital bed rental and leasing (i.e., home use) | 53228 Other Consumer Goods Rental | — |
| Hospital beds manufacturing | 339113 Surgical Appliance and Supplies Manufacturing | 800 employees |
| Hospital beds merchant wholesalers | 423450 Medical, Dental, and Hospital Equipment and Supplies Merchant Wholesalers | 200 employees |
| Hospital construction | 236220 Commercial and Institutional Building Construction | $45 million in average annual receipts |
| Hospital equipment and supplies merchant wholesalers | 423450 Medical, Dental, and Hospital Equipment and Supplies Merchant Wholesalers | 200 employees |
| Hospital equipment rental (i.e. home use) | 532283 Home Health Equipment Rental | $41 million in average annual receipts |
| Hospital furniture and equipment rental (i.e. home use) | 532283 Home Health Equipment Rental | $41 million in average annual receipts |
| Hospital furniture merchant wholesalers | 423450 Medical, Dental, and Hospital Equipment and Supplies Merchant Wholesalers | 200 employees |
| Hospital furniture, specialized (e.g., hospital beds, operating room furniture) | 339113 Surgical Appliance and Supplies Manufacturing | 800 employees |
| Hospital licensure agencies | 926150 Regulation, Licensing, and Inspection of Miscellaneous Commercial Sectors | — |
| Hospital management schools (except academic) | 611519 Other Technical and Trade Schools | $21 million in average annual receipts |
| Hospital management schools offering baccalaureate or graduate degrees | 611310 Colleges, Universities, and Professional Schools | $34.5 million in average annual receipts |
| Hospital service apparel, washable, cut and sew apparel contractors | 315210 Cut and Sew Apparel Contractors | 750 employees |
| Hospital service apparel, washable, men's and boys', cut and sew apparel contractors | 315211 Men's and Boys' Cut and Sew Apparel Contractors | — |
| Hospital service apparel, washable, men's and boys', cut and sewn from purchased fabric (except apparel contractors) | 315220 Men's and Boys' Cut and Sew Apparel Manufacturing | 750 employees |
| Hospital service apparel, washable, women's and girls', cut and sew apparel contractors | 315212 Women's, Girls', and Infants' Cut and Sew Apparel Contractors | — |
| Hospital service apparel, washable, women's and girls', cut and sewn from purchased fabric (except apparel contractors) | 315240 Women's, Girls', and Infants' Cut and Sew Apparel Manufacturing | 750 employees |
| Hospital service apparel, washable, women's, misses', and girls', cut and sewn from purchased fabric (except apparel contractors) | 315239 Women's and Girls' Cut and Sew Other Outerwear Manufacturing | — |
| Hospitality management schools (except academic) | 611519 Other Technical and Trade Schools | $21 million in average annual receipts |
| Hospitality management schools offering baccalaureate or graduate degrees | 611310 Colleges, Universities, and Professional Schools | $34.5 million in average annual receipts |
| Hospitalization insurance carriers, direct, without providing health care services | 524114 Direct Health and Medical Insurance Carriers | $47 million in average annual receipts |
| Hospitals for alcoholics | 622210 Psychiatric and Substance Abuse Hospitals | $47 million in average annual receipts |
| Hospitals, addiction | 622210 Psychiatric and Substance Abuse Hospitals | $47 million in average annual receipts |
| Hospitals, animal | 541940 Veterinary Services | $10 million in average annual receipts |
| Hospitals, general medical and surgical | 622110 General Medical and Surgical Hospitals | $47 million in average annual receipts |
| Hospitals, general pediatric | 622110 General Medical and Surgical Hospitals | $47 million in average annual receipts |
| Hospitals, intellectual and developmental disability | 623210 Residential Intellectual and Developmental Disability Facilities | $19 million in average annual receipts |
| Hospitals, mental (except intellectual and developmental disability) | 622210 Psychiatric and Substance Abuse Hospitals | $47 million in average annual receipts |
| Hospitals, psychiatric (except convalescent) | 622210 Psychiatric and Substance Abuse Hospitals | $47 million in average annual receipts |
| Hospitals, psychiatric convalescent | 623220 Residential Mental Health and Substance Abuse Facilities | $19 million in average annual receipts |
| Hospitals, psychiatric pediatric | 622210 Psychiatric and Substance Abuse Hospitals | $47 million in average annual receipts |
| Hospitals, specialty (except psychiatric, substance abuse) | 622310 Specialty (except Psychiatric and Substance Abuse) Hospitals | $47 million in average annual receipts |
| Hospitals, substance abuse | 622210 Psychiatric and Substance Abuse Hospitals | $47 million in average annual receipts |
| Hostels | 721199 All Other Traveler Accommodation | $9 million in average annual receipts |
| Hot air balloon ride, scenic and sightseeing, operation | 487990 Scenic and Sightseeing Transportation, Other | $25 million in average annual receipts |
| Hot beverage vending machines manufacturing | 333318 Other Commercial and Service Industry Machinery Manufacturing | 1,000 employees |
| Hot dip galvanizing metals and metal products for the trade | 332812 Metal Coating, Engraving (except Jewelry and Silverware), and Allied Services to Manufacturers | 600 employees |
| Hot dogs (except poultry) made from purchased carcasses | 311612 Meat Processed from Carcasses | 1,000 employees |
| Hot dogs (except poultry) produced in slaughtering plants | 311611 Animal (except Poultry) Slaughtering | 1,150 employees |
| Hot dogs, poultry, manufacturing | 311615 Poultry Processing | 1,250 employees |
| Hot forgings made from purchased iron or steel, unfinished | 332111 Iron and Steel Forging | 750 employees |
| Hot forgings made from purchased nonferrous metals, unfinished | 332112 Nonferrous Forging | 950 employees |
| Hot oil treating of oil field tanks on a contract basis | 213112 Support Activities for Oil and Gas Operations | $47 million in average annual receipts |
| Hot shot service on a contract basis | 213112 Support Activities for Oil and Gas Operations | $47 million in average annual receipts |
| Hot strip mill machinery, metalworking, manufacturing | 333519 Rolling Mill and Other Metalworking Machinery Manufacturing | 500 employees |
| Hot tub stores | 453998 All Other Miscellaneous Store Retailers (except Tobacco Stores) | $10 million in average annual receipts |
| Hot tubs merchant wholesalers | 423910 Sporting and Recreational Goods and Supplies Merchant Wholesalers | 100 employees |
| Hot tubs, coopered, manufacturing | 321920 Wood Container and Pallet Manufacturing | 500 employees |
| Hot tubs, plastics or fiberglass, manufacturing | 326191 Plastics Plumbing Fixture Manufacturing | 750 employees |
| Hot water bottles, rubber, manufacturing | 326299 All Other Rubber Product Manufacturing | 650 employees |
| Hot water heaters (including nonelectric), household-type, manufacturing | 335220 Major Household Appliance Manufacturing | 1,500 employees |
| Hot water heating system installation | 238220 Plumbing, Heating, and Air-Conditioning Contractors | $19 million in average annual receipts |
| Hot water tank installation | 238220 Plumbing, Heating, and Air-Conditioning Contractors | $19 million in average annual receipts |
| Hot-rolling iron or steel products in iron and steel mills | 331110 Iron and Steel Mills and Ferroalloy Manufacturing | 1,500 employees |
| Hot-rolling mill machinery, metalworking, manufacturing | 333519 Rolling Mill and Other Metalworking Machinery Manufacturing | 500 employees |
| Hot-rolling purchased steel | 331221 Rolled Steel Shape Manufacturing | 1,000 employees |
| Hotel building rental or leasing, not operating hotel | 531120 Lessors of Nonresidential Buildings (except Miniwarehouses) | $34 million in average annual receipts |
| Hotel construction | 236220 Commercial and Institutional Building Construction | $45 million in average annual receipts |
| Hotel equipment and supplies (except furniture) merchant wholesalers | 423440 Other Commercial Equipment Merchant Wholesalers | 100 employees |
| Hotel furniture merchant wholesalers | 423210 Furniture Merchant Wholesalers | 100 employees |
| Hotel management services (except complete operation of client's business) | 561110 Office Administrative Services | $12.5 million in average annual receipts |
| Hotel management services (i.e., providing management and operating staff to run hotel) | 721110 Hotels (except Casino Hotels) and Motels | $40 million in average annual receipts |
| Hotel reservation services | 561599 All Other Travel Arrangement and Reservation Services | $32.5 million in average annual receipts |
| Hotel tableware and kitchen articles, vitreous china, manufacturing | 327110 Pottery, Ceramics, and Plumbing Fixture Manufacturing | 1,000 employees |
| Hotels (except casino hotels) | 721110 Hotels (except Casino Hotels) and Motels | $40 million in average annual receipts |
| Hotels (except casino hotels) with golf courses, tennis courts, and/or other health spa facilities (i.e., resorts) | 721110 Hotels (except Casino Hotels) and Motels | $40 million in average annual receipts |
| Hotels, casino | 721120 Casino Hotels | $40 million in average annual receipts |
| Hotels, membership | 721110 Hotels (except Casino Hotels) and Motels | $40 million in average annual receipts |
| Hotels, resort, with casinos | 721120 Casino Hotels | $40 million in average annual receipts |
| Hotels, resort, without casinos | 721110 Hotels (except Casino Hotels) and Motels | $40 million in average annual receipts |
| Hotels, seasonal, with casinos | 721120 Casino Hotels | $40 million in average annual receipts |
| Hotels, seasonal, without casinos | 721110 Hotels (except Casino Hotels) and Motels | $40 million in average annual receipts |
| Hotline centers | 624190 Other Individual and Family Services | $16 million in average annual receipts |
| Hotplates, commercial-type, manufacturing | 333318 Other Commercial and Service Industry Machinery Manufacturing | 1,000 employees |
| Hotplates, household-type electric, manufacturing | 335210 Small Electrical Appliance Manufacturing | 1,500 employees |
| House demolishing | 238910 Site Preparation Contractors | $19 million in average annual receipts |
| House framing | 238130 Framing Contractors | $19 million in average annual receipts |
| House moving (i.e., raising from one site, moving, and placing on a new foundation) | 238990 All Other Specialty Trade Contractors | $19 million in average annual receipts |
| House painting | 238320 Painting and Wall Covering Contractors | $19 million in average annual receipts |
| House plant growing | 111422 Floriculture Production | $3.8 million in average annual receipts |
| House razing | 238910 Site Preparation Contractors | $19 million in average annual receipts |
| House sitting services | 812990 All Other Personal Services | $15 million in average annual receipts |
| House slippers manufacturing | 316210 Footwear Manufacturing | 1,000 employees |
| House slippers, plastics or plastics soled fabric upper, manufacturing | 316210 Footwear Manufacturing | 1,000 employees |
| House slippers, rubber or rubber soled fabric upper, manufacturing | 316210 Footwear Manufacturing | 1,000 employees |
| House-to-house direct selling | 454390 Other Direct Selling Establishments | $13 million in average annual receipts |
| Houseboat rental | 532284 Recreational Goods Rental | $9 million in average annual receipts |
| Housecoats cut and sew apparel contractors | 315210 Cut and Sew Apparel Contractors | 750 employees |
| Housecoats made in apparel knitting mills | 315190 Other Apparel Knitting Mills | 750 employees |
| Housecoats, infants', cut and sewn from purchased fabric (except apparel contractors) | 315291 Infants' Cut and Sew Apparel Manufacturing | — |
| Housecoats, women's, girls', and infants', cut and sew apparel contractors | 315212 Women's, Girls', and Infants' Cut and Sew Apparel Contractors | — |
| Housecoats, women's, girls', and infants', cut and sewn from purchased fabric (except apparel contractors) | 315240 Women's, Girls', and Infants' Cut and Sew Apparel Manufacturing | 750 employees |
| Housecoats, women's, misses', and girls', cut and sewn from purchased fabric (except apparel contractors) | 315231 Women's and Girls' Cut and Sew Lingerie, Loungewear, and Nightwear Manufacturing | — |
| Housedresses cut and sew apparel contractors | 315210 Cut and Sew Apparel Contractors | 750 employees |
| Housedresses, women's and girls', cut and sew apparel contractors | 315212 Women's, Girls', and Infants' Cut and Sew Apparel Contractors | — |
| Housedresses, women's and girls', cut and sewn from purchased fabric (except apparel contractors) | 315240 Women's, Girls', and Infants' Cut and Sew Apparel Manufacturing | 750 employees |
| Housedresses, women's, misses', and girls', cut and sewn from purchased fabric (except apparel contractors) | 315233 Women's and Girls' Cut and Sew Dress Manufacturing | — |
| Household oil storage tank installation | 238220 Plumbing, Heating, and Air-Conditioning Contractors | $19 million in average annual receipts |
| Household-type appliance stores | 443141 Household Appliance Stores | $19.5 million in average annual receipts |
| Household-type appliances (except water heaters, heating stoves (i.e., noncooking)), gas and electric, merchant wholesalers | 423620 Household Appliances, Electric Housewares, and Consumer Electronics Merchant Wholesalers | 225 employees |
| Household-type earthenware, semivitreous, manufacturing | 327110 Pottery, Ceramics, and Plumbing Fixture Manufacturing | 1,000 employees |
| Household-type furniture merchant wholesalers | 423210 Furniture Merchant Wholesalers | 100 employees |
| Household-type furniture, upholstered, manufacturing | 337121 Upholstered Household Furniture Manufacturing | 1,000 employees |
| Household-type furniture, wood, not upholstered (except TV and radio housings and sewing machine cabinets), manufacturing | 337122 Nonupholstered Wood Household Furniture Manufacturing | 750 employees |
| Household-type insecticides manufacturing | 325320 Pesticide and Other Agricultural Chemical Manufacturing | 1,150 employees |
| Household-type laundry equipment (e.g., dryers, washers) merchant wholesalers | 423620 Household Appliances, Electric Housewares, and Consumer Electronics Merchant Wholesalers | 225 employees |
| Household-type tableware and kitchen articles, vitreous china, manufacturing | 327110 Pottery, Ceramics, and Plumbing Fixture Manufacturing | 1,000 employees |
| Household-type timing mechanisms manufacturing | 334519 Other Measuring and Controlling Device Manufacturing | 600 employees |
| Household-type woodenware manufacturing | 321999 All Other Miscellaneous Wood Product Manufacturing | 500 employees |
| Households, private, employing (e.g., cooks, maids, chauffeurs, gardeners) | 814110 Private Households | — |
| Households, private, employing domestic personnel | 814110 Private Households | — |
| Housekeeping cabins | 721199 All Other Traveler Accommodation | $9 million in average annual receipts |
| Housekeeping cottages | 721199 All Other Traveler Accommodation | $9 million in average annual receipts |
| Housekeeping services (i.e., cleaning services) | 561720 Janitorial Services | $22 million in average annual receipts |
| Houses of correction | 922140 Correctional Institutions | — |
| Houses rental or leasing | 531110 Lessors of Residential Buildings and Dwellings | $34 million in average annual receipts |
| Houses, prefabricated metal, manufacturing | 332311 Prefabricated Metal Building and Component Manufacturing | 750 employees |
| Houses, prefabricated mobile homes, manufacturing | 321991 Manufactured Home (Mobile Home) Manufacturing | 1,250 employees |
| Houses, prefabricated, wood (except mobile homes), manufacturing | 321992 Prefabricated Wood Building Manufacturing | 500 employees |
| Housewares (except electric) merchant wholesalers | 423220 Home Furnishing Merchant Wholesalers | 100 employees |
| Housewares stores | 442299 All Other Home Furnishings Stores | $29.5 million in average annual receipts |
| Housewares, gas and electric, merchant wholesalers | 423620 Household Appliances, Electric Housewares, and Consumer Electronics Merchant Wholesalers | 225 employees |
| Housing assistance agencies | 624229 Other Community Housing Services | $19 million in average annual receipts |
| Housing authorities operating residential buildings | 531110 Lessors of Residential Buildings and Dwellings | $34 million in average annual receipts |
| Housing authorities, nonoperating | 925110 Administration of Housing Programs | — |
| Housing construction, for-sale builder | 236117 New Housing For-Sale Builders | $45 million in average annual receipts |
| Housing construction, merchant builder | 236117 New Housing For-Sale Builders | $45 million in average annual receipts |
| Housing police, government | 922120 Police Protection | — |
| Housing programs, planning and development, government | 925110 Administration of Housing Programs | — |
| Housing repair organizations, volunteer | 624229 Other Community Housing Services | $19 million in average annual receipts |
| Housing, multifamily, construction general contractors | 236116 New Multifamily Housing Construction (except For-Sale Builders) | $45 million in average annual receipts |
| Housing, single-family, construction general contractors | 236115 New Single-Family Housing Construction (except For-Sale Builders) | $45 million in average annual receipts |
| Hovercraft building | 336612 Boat Building | 1,000 employees |
| Hovercraft sightseeing operation | 487210 Scenic and Sightseeing Transportation, Water | $14 million in average annual receipts |
| Howitzers manufacturing | 332994 Small Arms, Ordnance, and Ordnance Accessories Manufacturing | 1,000 employees |
| Hubs, wood, manufacturing | 321999 All Other Miscellaneous Wood Product Manufacturing | 500 employees |
| Huckleberry farming | 111334 Berry (except Strawberry) Farming | $3.8 million in average annual receipts |
| Huckleberry greens, gathering of | 113210 Forest Nurseries and Gathering of Forest Products | $20.5 million in average annual receipts |
| HUD (heads-up display) systems, aeronautical, manufacturing | 334511 Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing | 1,350 employees |
| Huebnerite mining and/or beneficiating | 212299 All Other Metal Ore Mining | 750 employees |
| Hulling and shelling of nuts | 115114 Postharvest Crop Activities (except Cotton Ginning) | $34 million in average annual receipts |
| Hulling machinery, farm-type, manufacturing | 333111 Farm Machinery and Equipment Manufacturing | 1,250 employees |
| Human history museums | 712110 Museums | $34 million in average annual receipts |
| Human resource consulting services | 541612 Human Resources Consulting Services | $29 million in average annual receipts |
| Human rights advocacy organizations | 813311 Human Rights Organizations | $34 million in average annual receipts |
| Human rights commissions, government | 921190 Other General Government Support | — |
| Humane societies | 813312 Environment, Conservation and Wildlife Organizations | $19.5 million in average annual receipts |
| Humanities research and development services | 541720 Research and Development in the Social Sciences and Humanities | $28 million in average annual receipts |
| Humidifiers and dehumidifiers (except portable) merchant wholesalers | 423730 Warm Air Heating and Air-Conditioning Equipment and Supplies Merchant Wholesalers | 175 employees |
| Humidifiers and dehumidifiers, portable, merchant wholesalers | 423620 Household Appliances, Electric Housewares, and Consumer Electronics Merchant Wholesalers | 225 employees |
| Humidifiers, portable electric, manufacturing | 335210 Small Electrical Appliance Manufacturing | 1,500 employees |
| Humidifying equipment (except portable) manufacturing | 333415 Air-Conditioning and Warm Air Heating Equipment and Commercial and Industrial Refrigeration Equipment Manufacturing | 1,250 employees |
| Humidistats (e.g., duct, skeleton, wall) manufacturing | 334512 Automatic Environmental Control Manufacturing for Residential, Commercial, and Appliance Use | 650 employees |
| Humidity control system installation | 238210 Electrical Contractors and Other Wiring Installation Contractors | $19 million in average annual receipts |
| Humidity controls, air-conditioning-type, manufacturing | 334512 Automatic Environmental Control Manufacturing for Residential, Commercial, and Appliance Use | 650 employees |
| Humidity instruments (except industrial process and air-conditioning type) manufacturing | 334519 Other Measuring and Controlling Device Manufacturing | 600 employees |
| Humidity instruments, industrial process-type, manufacturing | 334513 Instruments and Related Products Manufacturing for Measuring, Displaying, and Controlling Industrial Process Variables | 750 employees |
| Humus, peat, mining and/or beneficiating | 212399 All Other Nonmetallic Mineral Mining | 500 employees |
| Hungarian partridge production | 112390 Other Poultry Production | $3.8 million in average annual receipts |
| Hunting camps with accommodation facilities | 721214 Recreational and Vacation Camps (except Campgrounds) | $9 million in average annual receipts |
| Hunting clubs, recreational | 713990 All Other Amusement and Recreation Industries | $9 million in average annual receipts |
| Hunting coats and vests cut and sew apparel contractors | 315210 Cut and Sew Apparel Contractors | 750 employees |
| Hunting coats and vests, men's and boys', cut and sew apparel contractors | 315211 Men's and Boys' Cut and Sew Apparel Contractors | — |
| Hunting coats and vests, men's and boys', cut and sewn from purchased fabric (except apparel contractors) | 315220 Men's and Boys' Cut and Sew Apparel Manufacturing | 750 employees |
| Hunting equipment and supplies merchant wholesalers | 423910 Sporting and Recreational Goods and Supplies Merchant Wholesalers | 100 employees |
| Hunting guide services | 713990 All Other Amusement and Recreation Industries | $9 million in average annual receipts |
| Hunting knives manufacturing | 332215 Metal Kitchen Cookware, Utensil, Cutlery, and Flatware (except Precious) Manufacturing | 1,000 employees |
| Hunting preserves | 114210 Hunting and Trapping | $8.5 million in average annual receipts |
| HVAC (heating, ventilation and air-conditioning) contractors | 238220 Plumbing, Heating, and Air-Conditioning Contractors | $19 million in average annual receipts |
| Hybrid computers manufacturing | 334111 Electronic Computer Manufacturing | 1,250 employees |
| Hybrid integrated circuits manufacturing | 334413 Semiconductor and Related Device Manufacturing | 1,250 employees |
| Hybrid striped bass production | 112511 Finfish Farming and Fish Hatcheries | $3.8 million in average annual receipts |
| Hydrant and flushing hydrant installation | 237110 Water and Sewer Line and Related Structures Construction | $45 million in average annual receipts |
| Hydrated lime (i.e., calcium hydroxide) manufacturing | 327410 Lime Manufacturing | 1,050 employees |
| Hydraulic aircraft subassemblies manufacturing | 332912 Fluid Power Valve and Hose Fitting Manufacturing | 1,000 employees |
| Hydraulic cylinders, fluid power, manufacturing | 333995 Fluid Power Cylinder and Actuator Manufacturing | 800 employees |
| Hydraulic equipment repair and maintenance services | 811310 Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance | $12.5 million in average annual receipts |
| Hydraulic fluids made in petroleum refineries | 324110 Petroleum Refineries | 1,500 employees |
| Hydraulic fluids, petroleum, made from refined petroleum | 324191 Petroleum Lubricating Oil and Grease Manufacturing | 900 employees |
| Hydraulic fluids, synthetic, manufacturing | 325998 All Other Miscellaneous Chemical Product and Preparation Manufacturing | 650 employees |
| Hydraulic fracturing wells on a contract basis | 213112 Support Activities for Oil and Gas Operations | $47 million in average annual receipts |
| Hydraulic hose fittings, fluid power, manufacturing | 332912 Fluid Power Valve and Hose Fitting Manufacturing | 1,000 employees |
| Hydraulic hoses (without fitting), rubber or plastics, manufacturing | 326220 Rubber and Plastics Hoses and Belting Manufacturing | 800 employees |
| Hydraulic power transmission equipment merchant wholesalers | 423830 Industrial Machinery and Equipment Merchant Wholesalers | 100 employees |
| Hydraulic pumps and parts merchant wholesalers | 423830 Industrial Machinery and Equipment Merchant Wholesalers | 100 employees |
| Hydraulic pumps, fluid power, manufacturing | 333996 Fluid Power Pump and Motor Manufacturing | 1,250 employees |
| Hydraulic slave cylinders, automotive, truck, and bus clutch, manufacturing | 336340 Motor Vehicle Brake System Manufacturing | 1,250 employees |
| Hydraulic turbine generator set units manufacturing | 333611 Turbine and Turbine Generator Set Units Manufacturing | 1,500 employees |
| Hydraulic turbines manufacturing | 333611 Turbine and Turbine Generator Set Units Manufacturing | 1,500 employees |
| Hydraulic valves, fluid power, manufacturing | 332912 Fluid Power Valve and Hose Fitting Manufacturing | 1,000 employees |
| Hydrazine manufacturing | 325180 Other Basic Inorganic Chemical Manufacturing | 1,000 employees |
| Hydrochloric acid manufacturing | 325180 Other Basic Inorganic Chemical Manufacturing | 1,000 employees |
| Hydrocyanic acid manufacturing | 325180 Other Basic Inorganic Chemical Manufacturing | 1,000 employees |
| Hydrodemolition (i.e., demolition with pressurized water) contractors | 238910 Site Preparation Contractors | $19 million in average annual receipts |
| Hydroelectric generating facility construction | 237990 Other Heavy and Civil Engineering Construction | $45 million in average annual receipts |
| Hydroelectric power generation | 221111 Hydroelectric Power Generation | 750 employees |
| Hydrofluoric acid manufacturing | 325180 Other Basic Inorganic Chemical Manufacturing | 1,000 employees |
| Hydrofluosilicic acid manufacturing | 325180 Other Basic Inorganic Chemical Manufacturing | 1,000 employees |
| Hydrofoil vessel building and repairing in shipyard | 336611 Ship Building and Repairing | 1,300 employees |
| Hydrogen manufacturing | 325120 Industrial Gas Manufacturing | 1,200 employees |
| Hydrogen peroxide manufacturing | 325180 Other Basic Inorganic Chemical Manufacturing | 1,000 employees |
| Hydrogen sulfide manufacturing | 325180 Other Basic Inorganic Chemical Manufacturing | 1,000 employees |
| Hydrogenating purchased oil | 311225 Fats and Oils Refining and Blending | 1,100 employees |
| Hydrographic mapping services | 541370 Surveying and Mapping (except Geophysical) Services | $19 million in average annual receipts |
| Hydrographic printing | 323111 Commercial Printing (except Screen and Books) | 650 employees |
| Hydrographic surveying services | 541370 Surveying and Mapping (except Geophysical) Services | $19 million in average annual receipts |
| Hydrology consulting services | 541690 Other Scientific and Technical Consulting Services | $19 million in average annual receipts |
| Hydrometers (except industrial process-type) manufacturing | 334519 Other Measuring and Controlling Device Manufacturing | 600 employees |
| Hydrometers, industrial process-type, manufacturing | 334513 Instruments and Related Products Manufacturing for Measuring, Displaying, and Controlling Industrial Process Variables | 750 employees |
| Hydronic circulator control, automatic, manufacturing | 334512 Automatic Environmental Control Manufacturing for Residential, Commercial, and Appliance Use | 650 employees |
| Hydronic heating equipment and supplies merchant wholesalers | 423720 Plumbing and Heating Equipment and Supplies (Hydronics) Merchant Wholesalers | 200 employees |
| Hydronic heating equipment manufacturing | 333414 Heating Equipment (except Warm Air Furnaces) Manufacturing | 500 employees |
| Hydronic heating system installation | 238220 Plumbing, Heating, and Air-Conditioning Contractors | $19 million in average annual receipts |
| Hydronic limit control manufacturing | 334512 Automatic Environmental Control Manufacturing for Residential, Commercial, and Appliance Use | 650 employees |
| Hydronic limit, pressure, and temperature controls, manufacturing | 334512 Automatic Environmental Control Manufacturing for Residential, Commercial, and Appliance Use | 650 employees |
| Hydrophones manufacturing | 334511 Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing | 1,350 employees |
| Hydroponic crop farming | 111419 Other Food Crops Grown Under Cover | $4.5 million in average annual receipts |
| Hydroquinone manufacturing | 325194 Cyclic Crude, Intermediate, and Gum and Wood Chemical Manufacturing | 1,250 employees |
| Hydroseeding services (e.g., decorative, erosion control purposes) | 561730 Landscaping Services | $9.5 million in average annual receipts |
| Hydrostatic drives manufacturing | 333996 Fluid Power Pump and Motor Manufacturing | 1,250 employees |
| Hydrostatic testing laboratories or services | 541380 Testing Laboratories and Services | $19 million in average annual receipts |
| Hydrostatic transmissions manufacturing | 333996 Fluid Power Pump and Motor Manufacturing | 1,250 employees |
| Hydrosulfites manufacturing | 325180 Other Basic Inorganic Chemical Manufacturing | 1,000 employees |
| Hydrotherapy equipment manufacturing | 339113 Surgical Appliance and Supplies Manufacturing | 800 employees |
| Hygrometers (except industrial process-type) manufacturing | 334519 Other Measuring and Controlling Device Manufacturing | 600 employees |
| Hygrometers, industrial process-type, manufacturing | 334513 Instruments and Related Products Manufacturing for Measuring, Displaying, and Controlling Industrial Process Variables | 750 employees |
| Hygrothermographs manufacturing | 334519 Other Measuring and Controlling Device Manufacturing | 600 employees |
| Hypnotherapists' offices (e.g., centers, clinics) | 621399 Offices of All Other Miscellaneous Health Practitioners | $10 million in average annual receipts |
| Hypnotic drugs, uncompounded, manufacturing | 325411 Medicinal and Botanical Manufacturing | 1,000 employees |
| Hypochlorites manufacturing | 325180 Other Basic Inorganic Chemical Manufacturing | 1,000 employees |
| Hypodermic needles and syringes manufacturing | 339112 Surgical and Medical Instrument Manufacturing | 1,000 employees |
| Hypophosphites manufacturing | 325180 Other Basic Inorganic Chemical Manufacturing | 1,000 employees |
Business activities are the U.S. Census Bureau's illustrative examples for each NAICS code, size standards the SBA's. An activity Census lists under a retired code and a code in use names only the code in use. Search NAICS codes
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