Map Collection: Geographic Information Systems ( GIS ) Data

State 

• Alaska Mapped: State Digital Mapping Initiative
• AZGEO ( Arizona ) 
• Arkansas Geographic Information Office
• Atlas: The Louisiana Statewide GIS\
• Central Florida Geographic Information Systems
• Delaware Spatial Data Clearinghouse
• District of Columbia Geographic Information System (DC GIS)
• GEOhio Spatial Information Portal
• Hawaii Statewide GIS Program
• Idaho Geospatial Office
• Illinois Natural Resources Geospatial Data Clearinghouse
• IndianaMAP
• Iowa Geospatial Data
• Kentucky Geography Network
• Maryland's Environmental Resources and Land Information Network ( MERLIN )
• Michigan GIS Open Data
• MIssissippi GIS Data
• Missouri Department of Natural Resources Geographic Information Systems
• Montana GIS Porrtal
• Nebraska Geospatial Data Center
• New Jersey Geographic Information Network
• New Mexico Resource Geographic Information System Program
• New York State GIS Clearinghouse
• North Carolina Onemap
• North Dakota Geographic Information Systems Hub
• Oregon Geospatial Data Clearinghouse
• Pennsylvania Spatial Data Access
• South Carolina Geographic Information Systems
• State of California Geoportal
• State of Colorado GIS : Coloradoview
• State of Kansas Data Access and Support Center
• Tennessee GIS Clearinghouse
• Texas Natural Resources Information System
• Utah Geospatial Resource Center
• Vermont Center for Geographic Information
• Virtual Clearinghouse for Nevada Geographic Information
• Washington State Geologic Information Portal
• West Virginia GIS Data Clearinghouse
• Wisconsin Department of Natural Resources Open Data Portal
• Wyoming Geographic Information Science Center

National

• Australian Data Archive
• EPA Ireland Geoportal
• Federal Geographic Data Committee ( United States )
• FIND; The Australian Government's Spatial Data Catalog 
• GeoConnections ( Canada )
• Geoportal CUZK ( Czech Republic )
• Geoportal.gov.pl ( Poland )
• Geospatial Data Gateway ( United States Department of Agriculture  )
• Irish Spatial Data Exchange
• Land Information New Zealand
• National Geospatial Advisory Committee ( United States )
• National Spatial Data Infrastructure ( United States )

International

• GISCO : Geographical Information and Maps ( European Commission )
• Global Runoff Data Center
• United Nations Geospatial Information Section
• United Nations Initiative on Global Geospatial Information Management