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NHGIS Project Description
The National Historical Geographic Information System (NHGIS) provides, free of charge, aggregate census data and GIS-compatible boundary files for the United States between 1790 and 2000.
Highlights of the NHGIS include:
- State and county statistical data from 1790-2000
- Census tract statistical data from 1910-2000
- Historic state and county boundary files (1790-2000) and census tract boundary files (1910-2000)
- All summary data (at all summary levels, including census blocks), 1970-2000.
- County Business Patterns, 1970-2000
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