The purpose of the Boundary and Annexation Survey (BAS) is to determine the inventory of
legally defined entities and the correct names, political descriptions and legal boundaries
of counties and equivalent areas, minor civil divisions, incorporated places, American Indian
reservations and American Indian off-reservation trust lands. The Census Bureau uses
boundary information provided through the BAS in various programs and surveys, such as the
Population Estimates Program, the American Community Survey and the 2002 Economic Census.
For more information about the BAS, please visit the Geography Division's BAS webpage at:
