Idaho
- Idaho Department of Water Resources
- INSIDE Idaho
- GAP Analysis - Northwest
- Idaho Geological Survey
- The Northwest Aquatic Information Network (Streamnet)
- Idaho Department of Lands
Montana
- Montana GIS Portal
- National Park Service Information (Yellowstone)
- Montana Natural Resource Information System
Oregon
- Oregon Spatial Data Library
- Oregon Geospatial Enterprise Office (GEO)
- Columbia River Estuary Land Cover Change Project
- Oregon Water Resources Department
- Portland Metro
- Jackson County
- Tillamook Coastal Watershed Resource Center
- The Northwest Habitat Institute
Washington
- Washington State Department of Natural Resources
- Washington Geographic Information Council
- Washington State Geospatial Clearinghouse
- Central Washington University GIS Lab
- ONRC Olympic Peninsula Clearinghouse
- Northwest Washington GIS Users' Group
- Western Washington University's Institute for Spatial Information and Analysis
Regional
- Streamnet - free downloadable data for all fish species in the PNW (WA,OR,ID,MT).
Federal
- Federal Geographic Data Committee
- Pacific Northwest National Forest Data
- US Geological Survey (USGS)
- Water Resources of Idaho (USGS)
- Water Resources of MT (USGS)
- Water Resources For Oregon (USGS)
- EROS Data Center (USGS)
- USGS Seamless Download Site
- Environmental Protection Agency (EPA)
- Pacific Region of the US Fish and Wildlife Service
- Federal Emergency Management Center (FEMA)
- Interior Columbia Basin Ecosystem Management Project (ICBEMP)
- National Transportation Atlas (US Dept. of Transportation)
- Natural Resources Conservation Service Data Clearinghouse
- Center for International Earth Science Information Network (CIESIN)
- NASA - Earth Science Division
- US Gazetteer from the US Census Bureau
- US Census Bureau TIGER Files
- GNIS Data Sets
- National Address Server (University of Buffalo)
