- Alabama Geological Survey
- Alaska State Geospatial Data Clearinghouse
- Arizona Geographic Information Council
- Arkansas GIS Gateway
- California Spatial Information Library
- University of Colorado Map Library
- University of Connecticut Map & Geographic Info Center
- Connecticut Dept of Environmental Protection
- Delaware DataMIL
- Florida Geographic Data Library
- Georgia GIS Data Clearinghouse
- Hawaii Statewide GIS Program
- INSIDE Idaho
- Illinois Natural Resources Data Clearinghouse
- Indiana GIS Initiative
- Iowa Geospatial Data Clearinghouse
- Iowa Dept. of Natural Resources
- Kansas Geospatial Community Commons
- Kentucky Office of GIS
- Louisiana MAP
- Maine Office of GIS
- Maryland State Geographic Information Committee
- Massachusetts Geographic Information System
- Michigan Center for Geographic Information
- Minnesota Land Management Information Center
- Mississippi Automated Resource Information System (MARIS)
- Missouri Spatial Data Information Service
- Montana State Library GIS Program
- Nebraska GIS Steering Committee
- Nevada Geographic Information Clearinghouse
- New Hampshire GRANIT net
- New Jersey Geographic Information Network
- New Mexico GIS Resources
- New York State Library GIS Clearinghouse
- North Carolina Center for Geographic Information & Analysis
- North Dakota Geographic Information Systems
- Ohio Geographically Referenced Information Program
- Oklahoma State GIS Council
- Oregon Geospatial Enterprise Office
- Pennsylvania Spatial Data Access
- Rhode Island GIS Data
- South Carolina: USC Data Server
- South Dakota Geological Survey
- South Dakota GIS
- Tennessee GISource
- Texas Natural Resource Information System GIS Data Catalog
- Utah Automated Geographic Reference Center
- Vermont Center for Geographic Information
- Virginia Digital Map Library
- Washington Geographic Information Council
- West Virginia GIS Data Clearinghouse
- Wisconsin Land Information Clearinghouse
- Wyoming GIS Resources
