The North American Industry Classification System (NAICS) is the standard used by Federal statistical agencies in classifying business establishments for the purpose of collecting, analyzing, and publishing statistical data related to the U.S. business economy.
Use NAICS codes in library databases like SimplyAnalytics, Business Insights Essentials, and others, to find companies in the same industry or business category. They can also be used to find labor and economic data.
HINT: Some people find it easier to browse and search for NAICS codes using the NAICS Assocation at NAICS.com. Same data; different interface.