What is NAICS code 561990?

NAICS 561990 is the industry "All Other Support Services" in the North American Industry Classification System, part of the Administrative and Support and Waste Management and Remediation Services sector (56).

What is the size standard for NAICS 561990?

The SBA sets a small business size standard for each NAICS code, either average annual receipts or number of employees. Check the current value for 561990 in the SBA table of size standards on sba.gov; it changes from time to time.

NAICS Code 561990: All Other Support Services

NAICS code 561990 is the industry for all other support services in the Administrative and Support and Waste Management and Remediation Services sector. Agencies tag every federal contract with a NAICS code, so this is the code to list in your SAM.gov registration and to search for bids.

Government contracts under NAICS 561990

Federal agencies obligated $4.9B on contracts under NAICS 561990 from FY2024 to FY2026, including $1.1B in FY2026. The biggest buyers were the Department of Defense, the Department of Energy, the Department of State. The largest contractors were Lockheed Martin Corporation, General Dynamics Information Technology, Inc., Vertex Modernization and Sustainment LLC.

See the full breakdown: government all other support services contracts, who wins and who buys.

Open government bids for NAICS 561990

The newest open notices from SAM.gov. Bidding needs a free SAM.gov registration.

Home Country Support Services
Homeland Security, Department of · Sources Sought · NAICS 561990 · DC
Posted Oct 30, 2026 · Responses due Nov 11, 2026

See all 1 open bids under NAICS 561990

Small business size standard for NAICS 561990

To bid on small business set-aside contracts under NAICS 561990, your business must be small under the SBA size standard for this code, measured either by average annual receipts or by number of employees. The values are updated periodically, so check the current SBA table of size standards before you bid.

Other NAICS codes in 5619

How to choose the right NAICS code

Pick the 6-digit code that best describes what you sell. List it as your primary code in SAM.gov, and add other codes for related work. Agencies choose one NAICS code for each contract, so check the codes on past awards for the kind of work you do. Search all codes in the NAICS code lookup.

Related guides

Frequently asked questions

What is NAICS code 561990?: NAICS 561990 is the industry "All Other Support Services" in the North American Industry Classification System, part of the Administrative and Support and Waste Management and Remediation Services sector (56).
What is the size standard for NAICS 561990?: The SBA sets a small business size standard for each NAICS code, either average annual receipts or number of employees. Check the current value for 561990 in the SBA table of size standards on sba.gov; it changes from time to time.
Are there government contracts for NAICS 561990?: Yes. Federal agencies obligated $4.9B on contracts under NAICS 561990 from FY2024 to FY2026, and 1 notices are open right now.