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. This layer is part of the 2014 ESRI Data and Maps collection for ArcGIS 10.2. U.S. Counties provides boundaries and demographic information for the U.S. counties. The boundaries are consistent with the tract, block group, and state datasets and are effective at county, regional, and state levels. TomTom North America and ESRI. (2014). United States Counties, 2010-2013. ESRI. Available at: http://purl.stanford.edu/yq450bw9891