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- U.S. Department of Commerce, U.S. Census Bureau, Geography Division33
- Pennsylvania Department of Transportation, Bureau of Planning and Research, Cartographic Information Division9
- Environmental Resources Research Institute8
- Allegheny County Division of Computer Services Geographic Information Systems Group6
- U.S. Geological Survey3
- Chester County DCIS/GIS2
- Pennsylvania. Dept. of Conservation and Natural Resources. Bureau of Forestry2
- Butler County1
- City Planning Commission (PCPC) Department - GIS Division1
- Environmental Resources Research Institute Eastern Pennsylvania Coalition for Abandoned Mine Reclamation (EPCAMR)1
- GIS Consortium1
- Jennifer M Brennan1
- Juniata County1
- Natural Lands Trust1
- PA DEP1
- PAMAP Program, Bureau of Topographic and Geologic Survey, PA Department of Conservation and Natural Resources1
- PAMAP Program, PA Department of Conservation and Natural Resources, Bureau of Topographic and Geologic Survey1
- Partnership for the Delaware Estuary1
- Penn State ORSER/ERRI1
- Pennsylvania Department of Environmental Protection1