Tutt Library Research Guides
Historical Census -State Demography Office
Census Quick facts - State, county, and large cities
1900 Census data for Colorado - by county or zip code
Colorado Census Records |Census Finder - 1860 forward
A Century of the Colorado Census, 1860 – 1970, HA 272.C39 1976
The Colorado Census, the Second Century, 1980, HA 272.C39 1984
See volumes for the state of Colorado in government documents Census stacks.