Pennsylvania State Government GIS

DCNR – Bureau of Topographic and Geologic Survey

Department of Agriculture

Department of Environmental Protection

Department of Health - EpiQMS

Department of Transportation

OIT - Bureau of Geospatial Technologies

Pennsylvania Spatial Data Access (PASDA)

Adams County

Allegheny County GIS

Centre County

Chester County

Clearfield County

Clinton County

Columbia County

Delaware County

Delaware Valley Regional Planning Commission

Erie County

Greene County

Lancaster County

Lebanon County

Lycoming County

Mifflin County

Pike County

SEDA-COG

Snyder County

Southwestern Pennsylvania Commission

Susquehanna River Basin Commission

Tri-County Regional Planning Commission

Union County

Westmoreland County

York County

Census Bureau Geography

Federal Geographic Data Committee (FGDC)

Geospatial One-Stop

National Atlas

USGS Geo-Data

Indiana  University of PA

Penn State

Temple University

Towson University

University of Pittsburgh

University of Pennsylvania

West Chester University

Wilkes University

Canaan Valley Institute

County Commissioners Association of Pennsylvania (CCAP)

GIS Certification Institute (GISCI)

National Association of Counties (Pennsylvania page)

National States Geographic Information Council (NSGIC)

Open Geospatial Consortium

Philadelphia Neighborhood Information System

The Imaging and Geospatial Information Society (ASPRS)

Urban and Regional Information Systems Association (URSIA)