National Historical Geographic Information System: Version 14.0

Steven Manson, Jonathan Schroeder, David Van Riper & Steven Ruggles
The National Historical Geographic Information System (NHGIS) provides free online access to summary statistics and GIS boundary files for U.S. censuses and other nationwide surveys from 1790 through the present. GIS files include: counties and states since 1790, census tracts since 1910, metropolitan areas since 1950, place and county subdivision boundaries since 1980, place points since 1900, all standard census reporting areas since 1990, 200 and 2010 centers of population for four geographic levels, and...
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