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NAICS code

A NAICS code is a 2- to 6-digit number from the North American Industry Classification System that describes what a business does, for example 237310 for highway, street and bridge construction.

Governments use NAICS codes to classify businesses: for small-business size standards, federal registrations, and some vendor directories. Each code gets more specific as digits are added (23 is construction; 2373 is highway, street and bridge construction; 237310 is the full code).

For county bids

Counties more often use NIGP codes for what they buy, but vendor registrations and certification programs frequently ask for NAICS codes. Pick every code that describes work you actually do.

FairCounty uses the NAICS codes in your Vault to improve bid matching.

Sources

Last reviewed Oct 30, 2026. This is general information, not legal advice. Laws and thresholds change; check the current statute and the bid documents.

What Is NAICS code? | FairCounty