2010. U.S. Census Bureau. Geography Division. This polygon data layer represents the 2010 TIGER/Line Census combined statistical areas for the United States. The TIGER/Line Files are shapefiles...
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2013. Rawson, Peg and United States. Bureau of Transportation Statistics. This polygon shapefile contains United States congressional district boundaries for 2013-2015. Congressional Districts are the 435 areas from which... United States. Bureau of Transportation Statistics.
2016. Hart Energy Publishing. This polygon shapefile represents counties in North America (Canada, Mexico, and the United States). Data includes county name and location by stat... Hart Energy Publishing.
1980. Geological Survey (U.S.). This polygon shapefile contains the 1980 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).
2005. Geological Survey (U.S.). This polygon shapefile portrays the 1990 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).
2000. Geological Survey (U.S.). This polygon shapefile portrays the 2000 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).
2014. United States. Bureau of Transportation Statistics. This polygon shapefile contains United States county boundaries with political limits extracted from the U.S. Census Bureau's MAF/TIGER Database (M... United States. Bureau of Transportation Statistics.
2010. U.S. Census Bureau. Geography Division. This polygon data layer represents the 2010 TIGER/Line census county subdivisions for the United States. The TIGER/Line Files are shapefiles and re...
2002. Lannoo, Michael J., Blackburn, Laura, and Nanjappa, Priya. This polygon shapefile portrays the distribution of 10 selected amphibians in the United States, based on historical literature and museum records ... National Atlas of the United States.
1992. National Imagery and Mapping Agency (now National Geospatial-Intelligence Agency). This datalayer is a point coverage representing aeronautical facilities located throughout DCW (Digital Chart of the World) geographic coverage as ... National Imagery and Mapping Agency.