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- Pennsylvania Department of Transportation, Bureau of Planning and Research, Geographic Information Division9
- Southeastern Pennsylvania Transporation Authority (SEPTA)5
- Pennsylvania Department of Transportation, Bureau of Planning and Research, Cartographic Information Division4
- Allegheny County Division of Computer Services Geographic Information Systems Group3
- Environmental Resources Research Institute3
- U.S. Geological Survey3
- PA DCNR and Rails-to-Trails Conservancy2
- PA Department of Conservation and Natural Resources2
- PAMAP Program, PA Department of Conservation and Natural Resources, Bureau of Topographic and Geologic Survey2
- Pennsylvania Department of Transportation, Bureau of Aviation2
- Pennsylvania Game Commission2
- Rails-to-Trails Conservancy2
- Southeastern Pennsylvania Transportation Authority2
- Allegheny County Division of Computer Services Geographic Information Systems Group; Modified by GDR for the Allegheny County CAD project, October 2008.1
- Appalachian Trail Conference1
- Chester County GIS Department1
- City of Philadelphia - Office of Emergency Management1
- Delaware River Basin Commission (DRBC)1
- Levinson, David M.1
- Owen, Andrew1