# NAICS code

Concept · [Business and metrics](https://ecosystem.samcarlton.com/business)

Also called: NAICS, NAICS codes, North American Industry Classification System, industry code

A number from the North American Industry Classification System that labels what industry a business is in. US [government contracts](https://ecosystem.samcarlton.com/government-contracting) and size rules often refer to it.

**For example:** A software firm lists its NAICS code when it registers to bid on federal contracts.

## Connects to (3)

- [Request for proposal](https://ecosystem.samcarlton.com/request-for-proposal): A document a buyer, often a government or large company, publishes to invite vendors to bid on a project.
- [Standard Occupational Classification](https://ecosystem.samcarlton.com/standard-occupational-classification): The official US system that sorts jobs into numbered occupations.
- [EIN](https://ecosystem.samcarlton.com/ein): Employer Identification Number.

Map view: https://ecosystem.samcarlton.com/naics-code