There is no central government agency with the role of assigning, monitoring, or approving NAICS codes for establishments. Different agencies maintain their own lists of business establishments to meet their own programmatic needs. These different agencies use their own methods for assigning NAICS codes to the establishments on their lists. Statistical agencies assign one NAICS code to each establishment based on its primary activity. For example, the Social Security Administration assigns a NAICS code to new businesses based on information provided on their application for an Employer Identification Number. The Census Bureau generally assigns NAICS codes to businesses on its list of establishments based on information provided by the business on a survey or census report form. The Bureau of Labor Statistics initially assigns NAICS codes based on business activity information provided on an application for unemployment insurance. [SOURCE: US NAICS MANUAL]
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