SIC Codes are published in the Standard Industrial Classification Manual, the Industry and Product Classification Manual and, in alphabetical order by subject, in the green pages of Standard & Poor's Register of Corporations, Directors and Executives. Alternatively, SIC Codes are posted on the Web by SEC Info (www.secinfo.com/$/SEC/SIC.asp?Start) and OSHA (www.osha.gov/pls/imis/sic_manual.html). You can search through the full text of the latest SIC Manual for free on the OSHA Web site (www.osha.gov/oshstats/sicser.html) or, for better searching, on Lexis (BUSREF;NAICS).
SIC Codes were last revised in 1987. They were replaced by the North American Industry Classification System (NAICS) for most -- but not all -- purposes when the NAICS Codes were published in 1997. Most significantly, SIC codes are still used in SEC filings.
SIC codes are expanded to 7 digits in the Numerical List of Manufactured Products.
To find out the names of companies with a given SIC code (or NAICS code), look in the SIC Code Index in the Directory of Corporate Affiliations. For public companies, you can search a database of SEC filings, such as SEC Info (www.secinfo.com/$/Home.asp). (For other searchable databases, see "Securities and Exchange Commission.")