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- United States Geological Survey18
- Environmental Systems Research Institute (Redlands, Calif.)17
- TomTom North America, Inc.13
- National Atlas of the United States and the United States Geological Survey12
- Tele Atlas B.V.8
- Tele Atlas North America, Inc.8
- Esri6
- GfK MACON6
- ESRI4
- Economic and Social Research Institute (Reston, Va.)4
- Tele Atlas (Firm : U.S.)2
- Health Forum, L.L.C.1
- TomTom International (Firm)1