Colorado Population By County in 2021

Updated on August 1, 2024.

Based on the US Census Vintage data estimates, in 2021, the population of Colorado was 5,811,596. Among all Colorado counties, El Paso had the highest population (737,287), followed by Denver (711,467), and Arapahoe (656,855). San Juan was the least populated county (741).

Hover over or click on the counties in the map below to see the populations. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.

You can see similar information for other states and by state for the United States.

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Colorado Population By County in 2021
Colorado Population By County in 2021
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County Population % of State Population
Adams 523544 9.01
Alamosa 16579 0.28
Arapahoe 656855 11.30
Archuleta 13806 0.24
Baca 3490 0.06
Bent 5339 0.09
Boulder 327084 5.63
Broomfield 75411 1.30
Chaffee 19741 0.34
Cheyenne 1719 0.03
Clear Creek 9457 0.16
Conejos 7582 0.13
Costilla 3613 0.06
Crowley 5735 0.10
Custer 5063 0.09
Delta 31392 0.54
Denver 711467 12.24
Dolores 2375 0.04
Douglas 369783 6.36
Eagle 55774 0.96
Elbert 27159 0.47
El Paso 737287 12.69
Fremont 49237 0.85
Garfield 62107 1.07
Gilpin 5893 0.10
Grand 15851 0.27
Gunnison 17294 0.30
Hinsdale 773 0.01
Huerfano 6934 0.12
Jackson 1359 0.02
Jefferson 580703 9.99
Kiowa 1454 0.03
Kit Carson 6927 0.12
Lake 7395 0.13
La Plata 56169 0.97
Larimer 362747 6.24
Las Animas 14334 0.25
Lincoln 5473 0.09
Logan 21006 0.36
Mesa 157439 2.71
Mineral 929 0.02
Moffat 13165 0.23
Montezuma 26234 0.45
Montrose 43236 0.74
Morgan 29006 0.50
Otero 18527 0.32
Ouray 5063 0.09
Park 17744 0.31
Phillips 4502 0.08
Pitkin 17337 0.30
Prowers 11990 0.21
Pueblo 169316 2.91
Rio Blanco 6442 0.11
Rio Grande 11406 0.20
Routt 25058 0.43
Saguache 6511 0.11
San Juan 741 0.01
San Miguel 8080 0.14
Sedgwick 2326 0.04
Summit 30998 0.53
Teller 24945 0.43
Washington 4868 0.08
Weld 339897 5.85
Yuma 9925 0.17