How to Find Government Contracts by NAICS Code

Every federal solicitation carries a NAICS code, and that six-digit number decides more than categorization: it sets the small business size standard, which set-asides you can claim, and whether your bid is even eligible. If you are searching for government contracts, NAICS is the sharpest filter you have. Here is how to use it well.

Step 1: Get your NAICS codes right

Most firms should carry one primary code and several secondary codes. Three rules of thumb:

• Match what you actually deliver, not what sounds impressive. Contracting officers check.
• Check the size standard for each code in the SBA size standards table. The same firm can be small under one code and not under another, because standards are set per code in either employees or annual receipts.
• Add adjacent codes. Agencies are inconsistent. Janitorial work shows up under 561720, but related facility work spreads across the 561 family. IT services scatter across 541511, 541512, 541519, and more.

Look codes up in the official NAICS index at census.gov, and confirm size standards at sba.gov. Both are linked on our resources page.

Step 2: Search federal opportunities on SAM.gov

SAM.gov's Contract Opportunities search lets you filter by NAICS directly, which beats keyword search almost every time. Keywords miss synonyms and catch noise. A NAICS filter catches everything the agency classified into your line of work.

Set a saved search per code, include Sources Sought and Presolicitation notice types, and check it daily. That last part is where the free approach starts to cost you: the notices arrive as raw lists, and every one still has to be read and qualified by a person. We wrote about where saved searches break down separately.

Step 3: Do not stop at federal

State and local governments buy the same services, often with less competition and shorter sales cycles, but there is no single SAM.gov for them. Procurement is spread across state portals, county sites, and city e-procurement systems, and most do not filter by NAICS at all. For a small team, covering even a handful of portals by hand is a part-time job.

Step 4: Search award history by NAICS

USAspending.gov lets you search past awards by NAICS code. This is the underrated move: it tells you which agencies buy what you sell, at what dollar values, from which competitors, and when those contracts expire. Expiring contracts in your NAICS are future solicitations, which is the whole idea behind recompete tracking.

The shortcut: let the matching run automatically

Everything above works, and it is roughly a daily hour of portal checking plus reading. The alternative is a NAICS-driven contract finder that does the aggregation and the first-pass qualification for you. BidCrow works from a profile you set once, in about 3 minutes: your NAICS codes, set-asides, certifications, capabilities, and team size. Every new federal, state, local, and grant opportunity is scored 0–100 against that profile, with an AI capture brief explaining the fit, the risks, and what to do this week. Your best matches arrive in a daily digest, and low scorers come with the reason to skip them.