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There are numerous web sites that offer free GIS data. Listed below are links to several good sources for GIS data at a regional or state level.
| Good source for state level data | http://www.gisdata.com/ |
| Free state data and links to other sources | http://www.rowekamp.com/gisdata.htm |
| Climate data and free GIS datasets | http://www.ocs.orst.edu/prism/prism_new.html |
| Water resources GIS data from USGS | http://water.usgs.gov/GIS/ |
| EROS Data Center(many free resources) | http://edcwww.cr.usgs.gov/eros-home.html |
| National Geophysical Data Center (NGDC) | |
| US Census | http://www.census.gov/ |
| National wetlands inventory | http://www.nwi.fws.gov/ |