Historical Census - years (1870 to 2011)
Population totals for Colorado, counties & places, 1870 to 2011 are available here.
Historical Census data can also be obtained through the University of Virginia. This site presents data for the people and the economy of the U.S. for each state and county from 1790 to 1960.
You may obtain a list of municipalities along with their dates of incorporation and county locations at the State Archives.
Population Estimates - years (1985 to Current)
Population estimates are produced annually by the State Demography Office. The most recent estimate available is for the year of 2012 and were finalized in October 2013.
This option allows the user to select any combination of state, counties or municipalities for the year(s) of 1980, 1990 to current.
Municipalities Within Counties:
This option allows the user to select a county and list the population estimates for all of the municipalities within that particular county. Years available 1980, 1990 to current.
County Profile's database allows the user to select population estimates along with other variables, for years 1985 to current.
Population Forecasts - years (2000 to 2040)
Population forecasts are produced annually by the State Demography Office. Our most recent forecasts were produced in October, 2013.
These tables illustrate the population for future years, based on plausible courses of future population change (see Forecasts Methodology for more information.) The forecasts are for Colorado counties and are available for the years 2000 to 2040.