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"What are industry codes and where do I find them?"

answer: 

Industry codes have been developed to provide a way to classify industries into categories. There are two main types of industry codes: Standard Industrial Classification (SIC) and North American Industry Classification System (NAICS) (A third classification, GICS, is used primarily by financial analysts.). The U.S. Department of Labor has a website that allows you to search for SIC codes by keyword. The Census Bureau has a website that allows you to search for NAICS codes by keyword.