When doing business research, it is useful to obtain the NAICS codes and SIC codes. The links below will help you find the codes for specific types of industries. You can also find NAICS and SIC codes by looking at the industry information for a company in a database like Mergent Intellect.
It is important to know these codes in order to retrieve statistical information produced by the Census. You can also use these codes to search in Bizminer, First Research, and Mergent Intellect.