U.S. County Boundaries

Metadata Updated: June 26, 2017

The TIGER/Line shapefiles and related database files (.dbf) are an extract of selected geographic and cartographic information from the U.S. Census Bureau's Master Address File / Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER) Database (MTDB). The MTDB represents a seamless national file with no overlaps or gaps between parts, however, each TIGER/Line shapefile is designed to stand alone as an independent data set, or they can be combined to cover the entire nation. 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. These incorporated places are known as independent cities and are treated as equivalent entities for purposes of data presentation. The District of Columbia and Guam have no primary divisions, and each area is considered an equivalent entity for purposes of data presentation. The Census Bureau treats the following entities as equivalents of counties for purposes of data presentationMunicipios in Puerto Rico, Districts and Islands in American Samoa, Municipalities in the Commonwealth of the Northern Mariana Islands, and Islands in the U.S. Virgin Islands. The entire area of the United States, Puerto Rico, and the Island Areas is covered by counties or equivalent entities. The boundaries for counties and equivalent entities are mostly as of January 1, 2013, primarily as reported through the Census Bureau's Boundary and Annexation Survey (BAS). However, some changes made after January 2013, including the addition and deletion of counties, are included.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. 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.S. Government Work.

Downloads & Resources


Metadata Created Date May 27, 2016
Metadata Updated Date June 26, 2017

Metadata Source

Harvested from DHS datajson source

Additional Metadata

Resource Type Dataset
Metadata Created Date May 27, 2016
Metadata Updated Date June 26, 2017
Publisher Under Secretary / Management
Unique Identifier 2762
Open Data (MGMT)
Maintainer Email
Public Access Level public
Accesslevelcomment American Samoa, Northern Mariana Islands, United States, Puerto Rico, & U.S Virgin Islands
Bureau Code 024:10
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Schema Version https://project-open-data.cio.gov/v1.1/schema
Harvest Object Id bfd1ca7e-921f-43b8-b6e1-549883b3d0e2
Harvest Source Id bd9faa28-bbb6-45f3-a4f0-d302a4a61802
Harvest Source Title DHS datajson source
Data Last Modified 2016-05-19
Program Code 024:003
Source Datajson Identifier True
Source Hash 711a575055675bf5b43a5663f52853156eabe52a
Source Schema Version 1.1

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