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1. United States Counties, 2010-2013

2010. TomTom North America, Inc. and Environmental Systems Research Institute (Redlands, Calif.). This polygon shapefile represents the counties of the United States in the 50 states, the District of Columbia, and Puerto Rico at 1:100,000 scale.... Environmental Systems Research Institute (Redlands, Calif.).

2. U.S. Counties (Generalized) 1992-2013

1992. Environmental Systems Research Institute (Redlands, Calif.). This polygon shapefile represents the counties of the United States in the 50 states and the District of Columbia at 1:3,000,000 scale. This layer ... Environmental Systems Research Institute (Redlands, Calif.).

3. U.S. States, 2007-2013

2010. TomTom North America, Inc. and Environmental Systems Research Institute (Redlands, Calif.). This polygon shapefile represents the 50 states, the District of Columbia, and Puerto Rico of the United States at 1:100,000 scale.This layer also ... Environmental Systems Research Institute (Redlands, Calif.).