Mainline Holdings, Inc.

Rapid City, SD Doing business as Mainline Contracting

UEI: SYY3E979M5L5
CAGE: 8LW37
Primary NAICS: 237110 Water and Sewer Line and Related Structures Construction
SAM.gov registration: Active through Jul 15, 2027

Company facts

Self-certified in SAM.gov: For Profit Organization
Entity structure: Corporate Entity (Not Tax Exempt)
Other NAICS codes in SAM.gov: 115112 Soil Preparation, Planting, and Cultivating

237310 Highway, Street, and Bridge Construction

238110 Poured Concrete Foundation and Structure Contractors

238210 Electrical Contractors and Other Wiring Installation Contractors

238220 Plumbing, Heating, and Air-Conditioning Contractors

238350 Finish Carpentry Contractors

238910 Site Preparation Contractors

238990 All Other Specialty Trade Contractors
Corporate family: Mainline Contracting

Mainline Contracting, Inc. Rapid City, SD V6XLFN9UFGB4
SAM.gov registration date: May 21, 2020
Physical address: 4900 SD-79, Rapid City, SD 57702, USA

Registration and certifications come from SAM.gov and the SBA; company details from public web sources. Updated Jul 17, 2026.

Yes. Mainline Holdings, Inc.'s SAM.gov registration is active through July 15, 2027.

Mainline Holdings, Inc.'s CAGE code is 8LW37, and its Unique Entity ID (UEI) is SYY3E979M5L5.

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