Local/Regional | State | National

Local/Regional

• Chester County Planning Commission Map Gallery
• DVRPC - Delaware Valley Regional Planning Commission
• The County of Lancaster
• The Count of Montgomery
• West Chester University

 State (Pennsylvania)

• DEP - Pennsylvania's Department of Environmental Protection
• PAGIC - Pennsylvania Geospatial Information Council
• PaMAGIC
  - Pennsylvania Mapping and Geographic Information Consortium
• PASDA - Pennsylvania Spatial Data Access
• PennDOT - Pennsylvania Department of Transportation
• PSLS - Pennsylvania Society of Land Surveyors
• PSU - Penn State Geographic Information Science

National (other states, Federal)

• AAG - American Association of Geographers
• AASHTO - The American Association of
  State Highway and Transportation Officials
• ACSM - American Congress on Surveying and Mapping
• APA - American Planning Association
• ASPRS - American Society for Photogrammetry & Remote Sensing
• California State Lands Commission
• Emergency Management
• FGDC - Federal Geographic Data Committee
• GITA - Geospatial Information & Technology Association
• IGIC - Idaho Geographic Information Center
• Iowa Department of Natural Resources - Geological Survey Bureau
• Maine Office of GIS
• MAPPS
  - Management Association for Private Photogrammetric Surveyors
• MARIS - Mississippi Automated Resource Information System
• MassGIS - Massachusetts GIS
• Minnesota Interagency Information Cooperative
• Minnesota Planning - Land Management Information Center
• NACIS - North American Cartographic Information Society
• NAS - National Academy of Sciences
• NGDC - National Geophysical Data Center
• NGS - National Geodetic Survey
• NIMA - National Imagery and Mapping Agency
• New Hampshire GRANIT GIS site
• New Hampshire Office of State Planning
• Texas Natural Resources Information Systems Navigator [USA][GOV]
• TRB - Transportation Research Board
• URISA - Urban and Regional Information Systems Association
• The US Department of Transportation
• USDOT Bureau of Transportation Statistics (BTS)
     - A wealth of transportation data - all free!
• US Bureau of the Census
• US EPA Clearinghouse Web Site for Sustainable Development
• USGS - United States Geological Survey
• US Library of Congresslc
• Vermont Center for Geographic Information