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.

NAICS was developed and adopted in 1997 to replace the Standard Industrial Classification (SIC) system. It was developed jointly by the U.S. Economic Classification Policy Committee (ECPC), Statistics Canada and Mexico's Instituto Nacional de Estadistica to allow for a high level of comparability in business statistics among the North American countries.

The official U.S. NAICS Manual includes definitions for each industry, background information, tables showing changes, and a comprehensive index. The official U.S. NAICS Manual is available in print and on CD-ROM from the National Technical Information Service (NTIS) at (800) 5‌53-6847 or (703) 6‌05-6000, or through the NTIS Web site. Previous versions of the NAICS Manual are available.

Additional information on the background and development of NAICS is available in the History section of this Web site.