NAICS Subsector 561: Administrative and Support Services
Subsector
Definition
Industries in the Administrative and Support Services subsector group establishments engaged in activities that support the day-to-day operations of other organizations. The processes employed in this sector (e.g., general management, personnel administration, clerical activities, cleaning activities) are often integral parts of the activities of establishments found in all sectors of the economy.
Read the full definition
The establishments classified in this subsector have specialization in one or more of these activities and can, therefore, provide services to clients in a variety of industries and, in some cases, to households. The individual industries of this subsector are defined on the basis of the particular process that they are engaged in and the particular services they provide. Many of the activities in this subsector are ongoing routine support functions that businesses and organizations perform in-house.
However, it is common to contract or purchase services from businesses that specialize in such activities and can, therefore, provide the services more efficiently. The industries in this subsector cannot be viewed as strictly "support." The Travel Arrangement and Reservation Services industry group includes travel agents, tour operators, and providers of other travel arrangement services, such as hotel and restaurant reservations and arranging the purchase of tickets, serving many types of clients, including individual consumers.
This group was placed in this subsector because the services are often of the "support" nature (e.g., travel arrangement) to businesses and other organizations that purchase such services. The administrative and management activities performed by establishments in this sector are typically on a contract or fee basis. These activities may also be performed by establishments that are part of the company or enterprise.
However, establishments involved in administering, overseeing, and managing other establishments of the company or enterprise are classified in Sector 55, Management of Companies and Enterprises. Establishments in Sector 55, Management of Companies and Enterprises, normally undertake the strategic and organizational planning and decision-making role of the company or enterprise. Government establishments engaged in administering, overseeing, and managing governmental programs are classified in Sector 92, Public Administration.
Government contracts for this service: PSC M1JZ Operation of Miscellaneous Buildings
Code facts
- Part of
-
- 56
- Codes under it
- 8
- Contract awards
- 23,294 In the last 12 months
- Contract obligations
- $55,202,948,002 In FY2025
NAICS codes and definitions come from the U.S. Census Bureau and contract spending from SAM.gov/FPDS.
Contract obligations by fiscal year
| Fiscal year | Obligated |
|---|---|
| FY2027 To date | $3,583,502,769 |
| FY2026 | $54,344,089,786 |
| FY2025 | $55,202,948,002 |
| FY2024 | $56,224,417,800 |
| FY2023 | $56,783,554,816 |
Top contractors by obligations
| Rank | Contractor | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | Triad National Security, LLC | $6,396,154,908 | |
| 2 | National Technology & Engineering Solutions Of Sandia, LLC | $5,735,417,678 | |
| 3 | Consolidated Nuclear Security, LLC | $3,640,136,497 | |
| 4 | Ut-Battelle LLC | $3,293,684,986 | |
| 5 | Savannah River Nuclear Solutions LLC | $2,988,222,472 | |
| 6 | Honeywell Federal Manufacturing & Technologies, LLC | $2,551,646,743 | |
| 7 | Pantexas Deterrence, LLC | $1,654,339,895 | |
| 8 | CSI Aviation, Inc. | $1,563,396,096 | |
| 9 | Mission Support & Test Services LLC | $1,142,896,546 | |
| 10 | V2X Systems LLC | $1,100,099,158 |
See the full FY2025 ranking of NAICS 561 contractors, by parent company.
Top funding agencies by obligations
| Rank | Agency | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | Department of Energy | $25,615,664,443 | |
| 2 | Department of Homeland Security | $7,526,773,215 | |
| 3 | Department of the Army | $5,239,502,332 | |
| 4 | Department of the Navy | $3,574,048,826 | |
| 5 | Air Force | $3,347,794,747 | |
| 6 | Department of Veterans Affairs | $1,687,920,373 | |
| 7 | Department of State | $1,614,538,398 | |
| 8 | Department of Health and Human Services | $1,478,659,495 | |
| 9 | General Services Administration | $974,843,827 | |
| 10 | National Aeronautics and Space Administration | $862,205,362 |
Top PSC codes by obligations
| Rank | PSC code | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | M1JZ Operation of Miscellaneous Buildings | $21,384,554,446 | |
| 2 | S206 Guard Services | $6,456,717,142 | |
| 3 | M181 Operation of Government-Owned Contractor-Operated (GOCO) R&D Facilities | $3,287,020,554 | |
| 4 | M159 Operation of Other Industrial Buildings | $2,986,957,321 | |
| 5 | R706 Logistics Support Services | $2,881,849,521 | |
| 6 | S216 Facilities Operations Support Services | $2,548,307,297 | |
| 7 | R499 Other Professional Services | $1,671,611,294 | |
| 8 | S201 Custodial Janitorial Services | $1,481,745,120 | |
| 9 | V211 Air Passenger Service | $1,475,794,225 | |
| 10 | Z1AA Maintenance of Office Buildings | $843,080,509 |
Contract obligations by state
| Rank | Place of performance | Obligated, last 12 months | Share |
|---|---|---|---|
| 1 | New Mexico | $12,040,641,377 | |
| 2 | Tennessee | $7,629,165,163 | |
| 3 | Texas | $5,093,589,735 | |
| 4 | Virginia | $3,214,905,738 | |
| 5 | South Carolina | $3,185,007,848 | |
| 6 | Missouri | $2,768,159,515 | |
| 7 | California | $2,045,046,901 | |
| 8 | District of Columbia | $1,455,791,786 | |
| 9 | Florida | $1,449,337,653 | |
| 10 | Maryland | $1,347,906,046 | |
| 11 | Nevada | $1,318,722,036 | |
| 12 | Colorado | $898,390,383 | |
| 13 | Georgia | $871,670,578 | |
| 14 | Kentucky | $853,557,071 | |
| 15 | New York | $694,695,662 | |
| 16 | Louisiana | $664,428,928 | |
| 17 | Pennsylvania | $576,791,039 | |
| 18 | Washington | $508,961,730 | |
| 19 | Alaska | $471,774,699 | |
| 20 | North Carolina | $336,296,590 | |
| 21 | Oklahoma | $323,164,164 | |
| 22 | Arizona | $316,844,373 | |
| 23 | Hawaii | $273,808,538 | |
| 24 | New Jersey | $264,823,304 | |
| 25 | Illinois | $253,052,700 | |
| 26 | Michigan | $223,199,321 | |
| 27 | Ohio | $223,038,688 | |
| 28 | Massachusetts | $221,977,628 | |
| 29 | Mississippi | $215,773,354 | |
| 30 | Guam | $211,917,123 | |
| 31 | Alabama | $195,466,840 | |
| 32 | West Virginia | $184,524,776 | |
| 33 | Utah | $155,808,358 | |
| 34 | Minnesota | $102,423,070 | |
| 35 | Puerto Rico | $92,935,382 | |
| 36 | Indiana | $84,159,442 | |
| 37 | Arkansas | $76,790,433 | |
| 38 | South Dakota | $65,475,606 | |
| 39 | Wisconsin | $64,338,045 | |
| 40 | Iowa | $63,875,522 | |
| 41 | Connecticut | $58,040,022 | |
| 42 | Oregon | $55,866,854 | |
| 43 | Nebraska | $50,610,485 | |
| 44 | Montana | $46,057,119 | |
| 45 | Kansas | $34,827,653 | |
| 46 | Maine | $30,528,839 | |
| 47 | North Dakota | $29,819,836 | |
| 48 | Rhode Island | $27,362,467 | |
| 49 | Idaho | $21,547,968 | |
| 50 | New Hampshire | $16,715,182 | |
| 51 | Vermont | $12,059,966 | |
| 52 | Wyoming | $8,323,948 | |
| 53 | Delaware | $7,743,002 | |
| 54 | Northern Mariana Islands | $3,113,192 | |
| 55 | U.S. Virgin Islands | $1,546,009 | |
| 56 | American Samoa | $231,795 |
Show all 56
Shares are of everything obligated under NAICS 561 in the last 12 months before deobligations, including work performed abroad or with no place of performance on record.
Contract opportunities
Show 40 more
Latest 50 of 115,854 listed here. See the rest on GovTribe.
Codes under 561
Quick answers
What is NAICS 561?
NAICS 561 is Administrative and Support Services, a subsector in NAICS 56, Administrative and Support and Waste Management and Remediation Services.
What codes are under NAICS 561?
NAICS 561 has 8 codes under it with their own GovTribe pages, including 5611 Office Administrative Services, 5612 Facilities Support Services and 5613 Employment Services.
How much do federal agencies spend under NAICS 561?
Federal contracts under NAICS 561 obligated $55,202,948,002 in fiscal year 2025 and $226,138,513,172 in fiscal years 2023 through 2027.
Who are the largest contractors under NAICS 561?
The contractors with the most obligated under NAICS 561 in fiscal years 2026 and 2027 are Triad National Security, LLC ($6,396,154,908); National Technology & Engineering Solutions Of Sandia, LLC ($5,735,417,678); and Consolidated Nuclear Security, LLC ($3,640,136,497).
Which agencies buy the most under NAICS 561?
The agencies that obligated the most under NAICS 561 in fiscal years 2026 and 2027 are Department of Energy ($25,615,664,443), Department of Homeland Security ($7,526,773,215) and Department of the Army ($5,239,502,332).
Which PSC codes are used with NAICS 561?
The PSC codes with the most obligated under NAICS 561 in fiscal years 2026 and 2027 are M1JZ Operation of Miscellaneous Buildings, S206 Guard Services and M181 Operation of Government-Owned Contractor-Operated (GOCO) R&D Facilities.
Where is the work under NAICS 561 performed?
By place of performance, the states with the most contract obligations under NAICS 561 over the last 12 months are New Mexico ($12,040,641,377), Tennessee ($7,629,165,163) and Texas ($5,093,589,735).
What is the latest contract opportunity under NAICS 561?
The latest contract opportunity under NAICS 561 is Snow Removal Services Gaylord, MI, solicitation from National Oceanic and Atmospheric Administration, posted November 12, 2026.
On GovTribe
See everything under NAICS 561
- Federal contract opportunities, awards and IDVs under this code
- Funding analysis by contractor, agency and set-aside
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