Industry Classification Codes

SIC/NAICS Classification Codes

The NAICS (North American Industry Classification Scheme) was introduced in 1997. It replaced the SIC Codes (Standard Industrial Classification Codes) which were last updated in 1987. The SIC codes, dispite their age, remain in popular use.

You will see many SIC codes with up to 8 digits. The last 4 digits are not part of the official code but have been developed by individual business services to further break out lines of business. The last 4 digits are not standard among business services.

Dun and Bradstreet's Million Dollar Directory - lists both SIC and NAICS codes.     HowTO

Conversion chart from the U.S. Census Department shows both SIC and NAICS classification schemes and provides a link between the two.

NAICS Desk Reference. Ref HF 1041.5 N35 2000 (Desk)

Standard industrial classification manual. Ref HF 1042 S73 1987