- World Data Site. Site coordinating data sets from around the world
- National Geosciences Data Repository System. US Data Sets. Maintained by American Geological Institute
- USGS Geospatial Clearinghouse
- U.S. National Atlas. Download ArcView layers, or view atlas interactively
- USGS Seamless National Elevation Data (NED) – Click and drag to select and download seamless DEMs