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47:. The project has created one of the largest collections in the world of statistical census information, much of which was not previously available to the research community because of legacy data formats and differences between metadata formats. The statistical and geographic data are disseminated free of charge through a sophisticated online data access system.
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created them. Census Tract boundaries are available 1910–present and Block Group and Block boundaries available 1990–present. The cartographic boundary files and the tabular data are formatted so as to be easily linked for use in
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compatible with every census, and over 50 million lines of metadata describing the collection. Historical U.S. state and county boundaries are available 1790–present, with smaller geographies available as the
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Much of the historical data are viewable as tables or interactive maps in Social
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In addition, NHGIS has created historical and contemporary cartographic boundary
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Building the
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
