NAICS Code Lookup for Federal Contractors

Every federal opportunity, registration, and contract award is tagged with a NAICS code (North American Industry Classification System), the six-digit number that tells the government what kind of work you do. Picking the right primary and secondary codes for your SAM.gov registration determines which solicitations you see, whether your small-business size standard applies, and how buyers find you. This free lookup covers more than 120 of the NAICS codes that appear most often across federal procurement, including professional and IT services (541xxx), administrative and facilities support (561xxx), construction (23xxxx), manufacturing, research and development, and transportation. Search by code or keyword below. Results show the exact code and official title so you can confirm what to enter in SAM.gov.

How to use NAICS codes in your federal strategy

Your primary NAICS code in SAM.gov signals your core business, while secondary codes broaden the solicitations you qualify for. Each code carries an SBA size standard (a revenue or employee ceiling) that determines whether you compete as a small business on a given contract. A few practical tips for contractors:

• Match codes to real past performance. Buyers and contracting officers cross-check your codes against your actual work. Claiming codes you cannot deliver on wastes everyone's time.
• Add secondary codes deliberately. Most agencies set aside work under specific codes. Carrying the right secondary codes means more set-aside opportunities reach you.
• Watch the size standard. The same firm can be small under one code and large under another, which changes your set-aside eligibility contract by contract.
• Track which codes your target agencies actually buy under. Spend concentrates in a handful of codes per agency. Knowing them tells you where the budget is.

From code to contract: find the work before it posts

A NAICS code tells you what you do. It does not tell you who is about to buy it. That is where FedFinder goes further than a static lookup. FedFinder delivers pre-RFP intelligence, so you can see budget signals, expiring incumbent contracts and recompetes, and sources-sought notices before the solicitation hits SAM.gov. Pair that with People intelligence on the contracting officers and program leads behind each buy, with verified contact paths, and you can shape a deal early instead of reacting to a posted RFP. Coverage spans federal, state and local, and commercial markets, and an AI copilot called The Closer helps you turn a NAICS code and an agency into a real capture plan.

Keep exploring

• Data-backed NAICS pages: see real spend, top agencies, and active opportunities for any code.
• Agency profiles: who buys what, which incumbents are up for recompete, and where the budget is moving.
• Start a 14-day full-access trial: transparent per-organization SMB pricing, no credit card games, and the full data set including pre-RFP signals and People intelligence.

Powered by FedFinder, GovCon contract intelligence at fedfinder.net. NAICS data reflects the 2022 NAICS revision used across SAM.gov and federal procurement. Always confirm current codes and size standards in SAM.gov before registering.