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The North American Industry Classification System or NAICS is a classification of business establishments by type of economic activity. It is used by government and business in Canada, Mexico, and the United States of America. It has largely replaced the older Standard Industrial Classification system, except in some government agencies, such as the U.S. Securities and Exchange Commission.
An establishment is typically a single physical location, though administratively distinct operations at a single location may be treated as distinct establishments. Each establishment is classified to an industry according to the primary business activity taking place there. NAICS does not offer guidance on the classification of enterprises which are composed of multiple establishments.