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Boundary and Annexation Survey (BAS) Codes

All federally recognized American Indian areas (AIA), governmental counties (and equivalent areas), incorporated places, consolidated cities, and governmental Minor Civil Divisions (MCDs) are assigned and identified by a unique BAS code. 

Please use the links below to determine the BAS code for your governmental unit. 


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Source: U.S. Census Bureau | Geography | (301) 763-1128 |  Last Revised: December 15, 2014