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The National Historical Geographic Information System (NHGIS) is a project to create and freely disseminate a database incorporating all available aggregate census information for the United States between 1790 and 2000. Census Tract Shapefiles are available for select areas for the 1940 – 1990 census.The NHGIS consists of three major components: 1)Collect and enrich historical and contemporary U.S. Census summary data; 2)Incorporate these data into a Geographic Information Systems framework; 3) Create a web-based system for access to both census data and the metadata. Free access, but requires you to register and login to use.

Coverage

United States; 1790 - 2011

Tags

Census
Geography
History
Medicine