Standard Industrial Classification (SIC) and North American Industry Classification System (NAIC) identify business activities of firms throughout Canada, Mexico, and the United States. SIC codes can be up to four digits and NAICS codes can be up to six digits. Business analysts, researchers, sales teams, and others use these codes to group firms together to create informative and useful information, such as identifying larger market trends and revealing company specific information about business activities. 

Unlike SIC codes, NAICS codes were developed by the U.S. government, with Canadian and Mexican assistance. Since Canada and Mexico use NAICS for their industry classifications, government and business analysts can compare industrial production statistics collected and published in the North American Free Trade Agreement (NAFTA) countries. 

Use the navigation tabs to the left to explore resources on NAICS and SIC classification codes.