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View All Topics and Subtopics Index A to Z

Age and Sex Business and Economy Education Emergency Management / Disasters Employment Families and Living Arrangements Geography Health Hispanic Origin Housing Income and Poverty International Trade Migration/Geographic Mobility Population Population Estimates Public Sector Race Redistricting Research Voting and Registration

Explore data on data.census.gov View all data resources

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America Counts: Stories Audio Blogs By the Numbers Facts for Features Fact Sheets Infographics and Visualizations Photos Publications Spotlights Stats for Stories Training (Census Academy) Videos Working Papers

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BAS Mapping Files

We use Partnership Shapefiles in the Boundary and Annexation Survey (BAS) to share data with and collect data from our partners. Shapefiles are GIS mapping files that contain geographical information, which are spatial data encoded into a file format.