The U.S. Census Bureau conducts the Boundary and Annexation Survey (BAS) annually to collect information about selected legally defined geographic areas. The BAS is used to update information about the legal boundaries and names of all governmental units in the United States. The Census Bureau uses the boundary information collected in the BAS to tabulate data for the decennial and economic censuses, and annual estimates and surveys such as the Population Estimates Program and the American Community Survey.
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2013 BAS Maps (in PDF format)
2013 BAS Shapefiles:
If your entity doesn't have any changes to report after reviewing your 2013 BAS materials, you may notify the Census Bureau by email, by online form, by phoning 1-800-972-5651, by returning the Annual Response Form, or by returning the paper No Change postcard, if you have already requested BAS materials be sent to you. To notify the Census Bureau electronically, please use the link below:
If your entity needs additional BAS materials or you need to make contact information changes, you may notify the Census Bureau by online form, by phoning 1-800-972-5651, or by returning the Annual Response Form.
Informational and tutorial videos on a variety of BAS related topics are now available on our BAS Videos page.