Tigerline shapefile

Government publications are required to be released into the public domain. 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 tigerline shapefile, cities, counties, congressional districts, tigerline shapefile, and school districts.

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Tigerline shapefile

The shapefile format was originally defined for use in Esri GIS applications, but the format has become an industry standard, and many GIS and mapping tools are able to read and write shapefile data. NHGIS generally identifies each GIS file by the survey year in which the file's represented areas were used for tabulations, which may be different than the vintage of the represented areas. For example:. This Census Bureau page identifies the vintages of geographic areas for each ACS survey year since NHGIS identifies these boundaries with , not , because they correspond to the boundaries of census units and are not completely consistent with the units identified in ACS tables. Most of the block group and census tract tables from the 5-Year ACS Summary File correspond to the Census definitions, but according to ACS documentation , "in 19 counties from 8 different states, many of the census tracts and block groups used to tabulate and present the ACS 5-year estimates are either those submitted to the Census Bureau for the Census, or a preliminary version of Census definitions. The block boundaries are derived primarily from the U. At this time, the block boundary files are complete only for selected metropolitan areas, and the files are not yet available through the Data Finder. They are instead available through the Block Boundaries page along with complete documentation and block-level summary statistics. In each case, we typically apply only our standard modifications for boundary files.

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Official websites use. Share sensitive information only on official, secure websites. The primary legal divisions of most states are termed counties. In Louisiana, these divisions are known as parishes. In Alaska, which has no counties, the equivalent entities are the organized boroughs, city and boroughs, municipalities, and for the unorganized area, census areas. The latter are delineated cooperatively for statistical purposes by the State of Alaska and the Census Bureau.

Official websites use. Share sensitive information only on official, secure websites. The primary legal divisions of most states are termed counties. In Louisiana, these divisions are known as parishes. In Alaska, which has no counties, the equivalent entities are the organized boroughs, city and boroughs, municipalities, and for the unorganized area, census areas. The latter are delineated cooperatively for statistical purposes by the State of Alaska and the Census Bureau. In four states Maryland, Missouri, Nevada, and Virginia , there are one or more incorporated places that are independent of any county organization and thus constitute primary divisions of their states.

Tigerline shapefile

Official websites use. Share sensitive information only on official, secure websites. The primary legal divisions of most states are termed counties. In Louisiana, these divisions are known as parishes. In Alaska, which has no counties, the equivalent entities are the organized boroughs, city and boroughs, municipalities, and for the unorganized area, census areas. The latter are delineated cooperatively for statistical purposes by the State of Alaska and the Census Bureau. In four states Maryland, Missouri, Nevada, and Virginia , there are one or more incorporated places that are independent of any county organization and thus constitute primary divisions of their states.

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NHGIS also supplies two types of point files: Centers of population for states, counties, tracts, and block groups Place points representing the functional centers of cities and villages Geometry years NHGIS generally identifies each GIS file by the survey year in which the file's represented areas were used for tabulations, which may be different than the vintage of the represented areas. Census Bureau as the source. Except where otherwise noted, content on this site is licensed under a Creative Commons Attribution 4. User Guide. Name of the repository software. Institution name. ZIP codes are based on postal delivery routes and may not correspond to municipalities. Research data repository language s. They contain features such as roads, railroads, hydrographic features and legal and statistical boundaries. The District of Columbia and Guam have no primary divisions, and each area is considered an equivalent entity for purposes of data presentation. License: No license information was provided. NHGIS identifies these boundaries with , not , because they correspond to the boundaries of census units and are not completely consistent with the units identified in ACS tables.

Official websites use.

The entire area of the United States, Puerto Rico, and the Island Areas is covered by counties or equivalent entities. For example:. Census Bureau's Centers of Population. As described in the Census Bureau's Centers of Population Computation documentation: "The center of population is the point at which an imaginary, weightless, rigid, and flat no elevation effects surface representation of [a geographic area] would balance if weights of identical size were placed on it so that each weight represented the location [of] one person. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U. Visit page. Government publications are required to be released into the public domain. Repository type s. Contact s. Data Basin depends on JavaScript to do it's job.