The United States acquired part of the area that is now Colorado from France as part of the Louisiana Purchase in 1803; part from territory ceded by Mexico in 1848, and part from territory sold to the United States by the state of Texas in 1850. Colorado Territory was organized from parts of Kansas, Nebraska, New Mexico, and Utah territories on February 28, 1861, with generally the same boundary as the present state.
Although the territory had not yet been legally established, census data for Colorado are available beginning with the 1860 census. The 1860 population shown for Colorado is for the portion of Kansas Territory that was organized as Colorado Territory. The 1860 population shown for Colorado excludes an undetermined number of people enumerated as part of Nebraska and New Mexico territories. The portion of present-day Colorado in Utah Territory—the portion west of the Rocky Mountains—was not enumerated in 1860. The population of the entire legally established Kansas Territory (of which the enumerated area of Colorado was a part) in 1860 was 141,483.
Data for the legally established state of Colorado are available beginning with the 1880 census.
See: Geographic Terms & Concepts
Counties & County Equivalents
There are 64 counties in Colorado. The cities and counties of Broomfield and Denver are consolidated city-county governments. They are classified as municipal governments, rather than as county governments, because they operate primarily as cities. In each of the remaining 62 counties, the governing body is the board of county commissioners.
Interactive Map of Colorado Counties | Static Overview Map of Colorado Counties
There are 209 county subdivisions in Colorado. They are all census county divisions (CCDs), which are delineated for statistical purposes, have no legal function, and are not governmental units.
Places (Incorporated Cities, Towns & Census Designated Places)
Colorado has 458 places; 271 incorporated places and 187 census designated places (CDPs). The incorporated places consist of 75 cities and 196 towns. Cities have a minimum population threshold of 2,000. Towns may be reclassified as cities when they reach the minimum population threshold.
Alphabetical List of Cities, Towns, CDPs and Other Populated Places
A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q, R | S | T | U, V | W, X, Y, Z
Colorado Civil Features
Colorado Civil Features: Political Subdivisions, Native Areas, Land Grants, etc. - sorted by Census Class Codes.
Metropolitan and Micropolitan Stastical Areas
There are 7 Metropolitan and 10 Micropolitan Statistical Areas in Colorado. CO Metopolitan & Micropolitan Areas
Colorado ZIP Code Tabulation Areas
There are 526 ZIP Code tabulation areas (ZCTAs) in Colorado. View Colorado ZIP Codes and ZIP Code Maps.
Colorado has 178 unified school districts. View Colorado Public and Private Schools.
Colorado has 7 congressional districts. An interactive map shows the contact information for each Representative as well as the boundaries for each Colorado district. View Map of Colorado Congressional Districts.
State Legislative Districts
There are 35 state senate districts and 65 state house districts in Colorado.
American Indian Areas
Colorado has two federally recognized American Indian reservations.