Federal NAICS code directory
62 top federal-spend NAICS codes grouped by sector. Each links to a deep-dive page with top contractors, recent awards, agency breakdown, and pricing intelligence.
Professional, Scientific & Technical Services
The largest federal services sector — engineering, IT, management consulting, R&D, and other knowledge-work contracts.
Construction
Federal construction, renovation, and infrastructure contracts — military bases, civil works, federal buildings.
Manufacturing
Defense and dual-use manufacturing — aerospace, vehicles, electronics, pharmaceuticals.
Facilities & Support Services
Operations and maintenance, security, janitorial — long-running federal services contracts.
Healthcare & Social Assistance
VA, DoD, IHS, and HHS clinical and support services.
Educational Services
Training, simulation, education, and curriculum development for federal agencies.
Transportation & Logistics
Federal logistics, freight, and storage contracts — DLA, USPS, DoD.
Information & Telecommunications
Federal data, telecom, broadcasting, and content contracts.
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FAQ
What is a NAICS code?
NAICS (North American Industry Classification System) codes are 6-digit identifiers the U.S. government uses to classify the type of work being procured. Every federal contract is tagged with at least one NAICS code, and your firm must be registered in SAM.gov under each NAICS code you want to bid in.
Which NAICS codes have the most federal spend?
R&D (541715), professional services (541330, 541511, 541512), construction (236220), facilities support (561210), and aircraft manufacturing (336411) are consistently among the largest federal NAICS codes by obligation. Spend distribution shifts year-to-year based on agency priorities.
Can my firm be registered under multiple NAICS codes?
Yes — there is no limit. Most federal contractors carry 5-15 NAICS codes covering their primary line of work plus adjacent capabilities. SAM.gov lets you add and remove NAICS codes any time without re-registering.
How do I pick the right NAICS for a solicitation?
The contracting officer assigns the NAICS code on the solicitation. Your job is to make sure your SAM.gov registration includes that code. If you believe the agency picked the wrong NAICS (it changes the size standard), you can file a NAICS appeal with the SBA within 10 days of the solicitation issue date.