The National Historical Geographic Information System is a project to create and freely disseminate a database incorporating all available aggregate census information for the United States between 1790 and 2000. The data being incorporated into NHGIS covers social and economic topics, such as income, education, labor, housing, elections, religion, and agriculture. When complete, NHGIS will provide data for various levels of geography. Contains aggregate census data and GIS-compatible boundary files for the United States between 1790 and 2010 including: Historical Censuses (1790-1960), Modern Censuses: Core Summary Files (1970-2010), Modern Censuses: Special & Supplemental Files (1980-1990), County Business Patterns (1974-2003), American Community Survey (2010)
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