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- Environmental Systems Research Institute (Redlands, Calif.)41
- DeLorme Publishing Company, Inc.9
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- Michael Bauer Research GmbH3
- National Atlas of the United States and the United States Geological Survey3
- U.S. Department of Commerce, Census Bureau, Esri3
- Esri2
- United States Geological Survey2
- World Wildlife Fund2
- Bureau of Transportation Statistics1
- Economic and Social Research Institute (Reston, Va.)1
- National Park Service1
- U.S. Census Bureau, Geography Division1
- U.S. Geological Survey in cooperation with U.S. Environmental Protection Agency1