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  2. National Historical Geographic Information System - Wikipedia

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

    The National Historical Geographic Information System (NHGIS) is a historical GIS project to create and freely disseminate a database incorporating all available aggregate census information for the United States between 1790 and 2010. The project has created one of the largest collections in the world of statistical census information, much of ...

  3. Tract index - Wikipedia

    en.wikipedia.org/wiki/Tract_index

    The number of sections within a jurisdiction dictates how many volumes are needed for a single period. In comparison to the atlas (also called a plat map or cadastral map ), which is a graphic representation of land ownership in a township for the date of publication, the tract index is relatively dynamic. [ 2 ]

  4. 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.

  5. 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.

  6. Section (United States land surveying) - Wikipedia

    en.wikipedia.org/wiki/Section_(United_States...

    The legal description of a tract of land under the PLSS includes the name of the state, name of the county, township number, range number, section number, and portion of a section. Sections are customarily surveyed into smaller squares by repeated halving and quartering. A quarter section is 160 acres (65 ha) and a "quarter-quarter section" is ...

  7. Lot and block survey system - Wikipedia

    en.wikipedia.org/wiki/Lot_and_block_survey_system

    A type of the Lot and Block system is frequently used for tax identification purposes in the United States. This designation, often called a Tax Identification Number or Tax Parcel Number, is not directly based on the legal description of the property. The system can be used even if the property is not legally described by the Block and Lot system.

  8. Census block - Wikipedia

    en.wikipedia.org/wiki/Census_block

    A census block is the smallest geographic unit used by the United States Census Bureau for tabulation of 100-percent data (data collected from all houses, rather than a sample of houses). The number of blocks in the United States , including Puerto Rico and other island areas, for the 2020 Census was 8,180,866.

  9. List of census-designated places - Wikipedia

    en.wikipedia.org/wiki/List_of_census-designated...

    This page was last edited on 12 January 2025, at 06:14 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.