1972. Geological Survey (U.S.). This map layer portrays the 2000 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer was crea... U.S. Geological Survey.
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2008. U.S. Geological Survey. National Populated Places 2000 is a point theme representing cities in the United States, Puerto Rico and the U.S. Virgin Islands. These cities we... U.S. Geological Survey.
2011. United States. Bureau of Transportation Statistics. This data set includes cities in the United States, Puerto Rico and the U.S. Virgin Islands. These cities were collected from the 1970 National Atl... U.S. Geological Survey.