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  2. National Historical Geographic Information System - Wikipedia

    en.wikipedia.org/wiki/National_Historical...

    The statistical and geographic data are disseminated free of charge through a sophisticated online data access system. [ 1 ] In addition, NHGIS has created historical and contemporary cartographic boundary shapefiles compatible with every census, and over 50 million lines of metadata describing the collection.

  3. Topologically Integrated Geographic Encoding and Referencing

    en.wikipedia.org/wiki/Topologically_Integrated...

    TIGER includes both land features such as roads, rivers, and lakes, as well as areas such as counties, census tracts, and census blocks. Some of the geographic areas represented in TIGER are political areas, including state and federally recognized tribal lands, cities, counties, congressional districts, and school districts.

  4. List of GIS data sources - Wikipedia

    en.wikipedia.org/wiki/List_of_GIS_data_sources

    Online collection of all digital USGS 1:24K scale topographic maps (as well as various other GIS data) covering the United States, available as a free download. NPScape United States Department of the Interior National Park Service NPScape is a landscape dynamics monitoring project that provides landscape-level data, tools, and evaluations for ...

  5. 2000 United States census - Wikipedia

    en.wikipedia.org/wiki/2000_United_States_census

    Full documentation on the 2000 census, including census forms and a procedural history, is available from the Integrated Public Use Microdata Series. This was the first census in which a state— California —recorded a population of over 30 million, as well as the first in which two states—California and Texas —recorded populations of ...

  6. United States census - Wikipedia

    en.wikipedia.org/wiki/United_States_census

    Every census up to and including 1950 is currently available to the public and can be viewed on microfilm released by the National Archives and Records Administration, the official keeper of archived federal census records. Complete online census records can be accessed for no cost from National Archives facilities and many libraries, [43] and ...

  7. Census tract - Wikipedia

    en.wikipedia.org/wiki/Census_tract

    A census tract, census area, census district or meshblock [1] is a geographic region defined for the purpose of taking a census. [2] Sometimes these coincide with the limits of cities , towns or other administrative areas [ 2 ] and several tracts commonly exist within a county.

  8. Core-based statistical area - Wikipedia

    en.wikipedia.org/wiki/Core-based_statistical_area

    An enlargeable map of the New England city and town areas (NECTAs) of the United States An enlargeable map of the 929 core-based statistical areas (CBSAs) of the United States and Puerto Rico. The 388 metropolitan statistical areas (MSAs) are shown in dark green. The 541 micropolitan statistical areas (μSAs) are shown in light green.

  9. Public Use Microdata Area - Wikipedia

    en.wikipedia.org/wiki/Public_Use_Microdata_Area

    As of 2022, based on the results of the 2020 Census, there are 2,487 PUMAs. PUMAs allow the Census to publish census data for sub-state areas throughout every state. For example, the ACS publishes detailed data every year, but due to their sampling procedure only publishes data for census area that have more than 65,000 People.