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The USGS Governmental Unit Boundaries service from The National Map (TNM) represents major civil areas for the Nation, including States or Territories, counties (or equivalents), Federal and Native American areas, congressional districts, minor civil divisions, incorporated places (such as cities and towns), and unincorporated places. Boundaries data are useful for understanding the extent of jurisdictional or administrative areas for a wide range of applications, including mapping or managing resources, and responding to natural disasters. Boundaries data also include extents of forest, grassland, park, wilderness, wildlife, and other reserve areas useful for recreational activities, such as hiking and backpacking. Boundaries data are acquired from a variety of government sources. The data represents the source data with minimal editing or review by USGS. Please refer to the feature-level metadata for information on the data source. The National Map boundaries data is commonly combined with other data themes, such as elevation, hydrography, structures, and transportation, to produce general reference base maps. The National Map download client allows free downloads of public domain boundaries data in either Esri File Geodatabase or Shapefile formats. For additional information on the boundaries data model, go to http://nationalmap.gov/boundaries.html.
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USGS The National Map: National Boundaries Dataset
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Title: USGS TNM Governmental Unit Boundaries
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Author: U. S. Geological Survey - National Geospatial Program
Comments: See http://viewer.nationalmap.gov/help for assistance with The National Map viewer, services, or metadata.
Keywords: ngda,boundary,government,administrative,federal,state,territory,reserve,native american area,county,parish,municipio,borough,minor civil division,congressional district,incorporated place,unincorporated place,United States,US,NGP-TNM,REST,WMS,WFS
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