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 various censuses and surveys, such as the American Community Survey and other Census Bureau programs, such as the Population Estimates Program.
The links below provide detailed information about the 2008 BAS for participants and other interested parties. Links to other Census Bureau programs and surveys are listed under "Related Program Links".
Response MethodsThis link provides information about the different ways in which participants can respond to the BAS.
Materials (forms, letters, postcards, respondent guides) for:
Counties, Minor Civil Division (MCDs), and Places
American Indian Areas
Frequently Asked Questions (FAQs)
County Consolidation Agreements
BAS Related Programs BAS Program Contact Information for:
Counties, MCDs, and Places
American Indian Areas
2007 New Incorporations [Excel] [Text]
American Indian Entities and Codes
BAS Entities Detailed by State
BAS Entities Summarized by State & Type (County, Place, MCD)
Entities Eligible for Digital BAS [Excel] [Text]
American Community Survey
Census Bureau FIPS Page
Census Bureau Geographic Programs
Geographically Updated Population Certification Program (GUPCP)
Population Estimates Program
Special Census Program
Local Update of Census Addresses (LUCA)
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