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NAICS Codes
The North American Industry Classification System (NAICS) replaces the SIC (Standard Industrial Classification) codes. This is a page by the US Census Bureau that includes the text of press releases, NAICS and SIC comparability tables, NAICS implementation schedules, NAICS official notices, papers and reports relating to industrial classifications, and other papers and reports about NAICS. You can copy the full-text documents. There are also links to the concerned Canadian and Mexican offices.

NTIS (National Technical Information Service)
This is the official site to order either the CD-ROM or printed version of the NAICS manual.

Standard Industrial Classification Search
Use this site to search the 1987 Standard Industrial Classification Manual (SIC codes) by keyword. Go to SIC Division Structure to access the text of the SIC Codes by "Division" and "Major Group".

SICCode.com
This site organizes businesses by SIC code and includes a SIC Code/NAICS Code Cross Reference Database with a search window. Search by SIC, NAICS, or by industry description.