2011. United States. Bureau of the Census. Geography Division and United States. Bureau of Transportation Statistics. This polygon shapefile contains United States administrative county boundaries extracted from the U.S. Census Bureau's MAF/TIGER Database (MTDB). T... United States. Bureau of Transportation Statistics.
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2011. TomTom North America, Inc. and Environmental Systems Research Institute (Redlands, Calif.). U.S. Counties represents the counties of the United States in the 50 states, the District of Columbia, and Puerto Rico. Esri.
2011. TomTom North America, Inc. and Environmental Systems Research Institute (Redlands, Calif.). U.S. County Boundaries represents the boundary lines of the counties of the United States. Esri.