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- Environmental Systems Research Institute (Redlands, Calif.)60
- TomTom North America, Inc.54
- National Atlas of the United States and the United States Geological Survey27
- Esri26
- Tele Atlas North America, Inc.26
- Tele Atlas B.V.20
- United States Geological Survey19
- Economic and Social Research Institute (Reston, Va.)16
- GfK MACON14
- ESRI8
- Tele Atlas (Firm : U.S.)5
- U.S. Department of Commerce, Census Bureau5
- General Drafting Company3
- U.S. Census Bureau, Geography Division3
- Medrano2
- National Atlas of the United States2
- TomTom International (Firm)2
- U.S. Department of Commerce, Census Bureau, Geography Division2
- GfK GeoMarketing GmbH 1
- Health Forum, L.L.C.1