Sources for industry data, news and analysis:
SIC and NAICS codes can be useful tools when doing research on an industry or looking into a company's competitors.They are American standard codes and they essentially classify the industry areas in which companies operate.
The quickest way to look up SIC and NAICS classifications is to use the US Census correspondence tables:
There are still some official documents using the SIC codes, but these were superseded by the NAICS (north American Industrial Classification System) codes in 1997.
To explore SIC and NAICS codes, you can also use the lookup function available in Nexis Uni Company Dossier.