Contours with 1 foot intervals and related index files. This data can be searched by keyword or browsed by subject and are available in a variety of formats, including KML, WMS, GeoRSS, and Shapefile.

Direct link to download a geodatabase containing elevation contours for the entire state of Colorado at contour intervals of 10, 20, and 40. The most recent contour line was entered on 10/01/2009. Dataset is maintained by the U.S. Geological Survey.

The National Map Downloader allows users to pan over the United States (Alaska and Hawaii included) and download elevation maps and data products. Downloadable items include topographic maps, DEMS, LiDAR data, hydrography, transportation, and woodland tint data.