The U.S. Census Bureau conducts the Boundary and Annexation Survey (BAS) annually to collect information about selected legally defined geographic areas. Notices are sent to the Highest Elected Official and/or BAS contact in local jurisdictions each December.  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.

pdf  census-bas-info-handout.pdf (61.44 kB)

NOTICE:  2014 BAS Program Suspended

The U. S. Census Bureau has suspended the Boundary and Annexation Survey (BAS) for fiscal year (FY) 2014, which runs from October 1, 2013 to September 30, 2014.  We are hoping the program will resume again for 2015 – watch for information on this in November or December of 2014. All governmental units in the Bi-State Region received correspondence from the U.S. Census Bureau in late October 2013 regarding the suspension.
For more information visit or contact our Data Services Staff.