Identify NAICS and SIC codes
- Both NAICS (North American Industry Classification System) and older SIC (Standard Industrial Classification) codes are used to categorize companies into industries.
- Browse or search the NAICs site and note the NAICS codes as well as the SIC codes for your industry and its suppliers, distributors and customers http://www.naics.com/search/
NAICS codes are hierarchical
The codes are 6 digits long, but you can use just part of the code in order to search a broader group of industries. For instance, "Confectionery Manufacturing from Purchased Chocolate" has the code 311330, but the shorter 3113 works for all of the different industries that fall under "Sugar and Confectionery Product Manufacturing".