Colorado Population By County in 2021
Updated on June 16, 2025.
Based on the US Census Vintage data estimates, in 2021, the population of Colorado was 5,814,036. Among all Colorado counties, El Paso had the highest population (738,811), followed by Denver (711,530), and Arapahoe (656,952). San Juan was the least populated county (738).
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.
Related Topics: Colorado Census Vintage Data Topic List.
Data Source: US Census Bureau (Vintage).
See this for other years:
Colorado Population By County in 2021
Colorado Population By County in 2021
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| County | Population | % of State Population |
|---|---|---|
| Adams | 523603 | 9.01 |
| Alamosa | 16578 | 0.28 |
| Arapahoe | 656952 | 11.30 |
| Archuleta | 13809 | 0.24 |
| Baca | 3491 | 0.06 |
| Bent | 5346 | 0.09 |
| Boulder | 327133 | 5.63 |
| Broomfield | 75430 | 1.30 |
| Chaffee | 19743 | 0.34 |
| Cheyenne | 1719 | 0.03 |
| Clear Creek | 9425 | 0.16 |
| Conejos | 7579 | 0.13 |
| Costilla | 3614 | 0.06 |
| Crowley | 5733 | 0.10 |
| Custer | 5065 | 0.09 |
| Delta | 31387 | 0.54 |
| Denver | 711530 | 12.24 |
| Dolores | 2376 | 0.04 |
| Douglas | 369826 | 6.36 |
| Eagle | 55787 | 0.96 |
| Elbert | 27152 | 0.47 |
| El Paso | 738811 | 12.71 |
| Fremont | 49251 | 0.85 |
| Garfield | 62116 | 1.07 |
| Gilpin | 5891 | 0.10 |
| Grand | 15854 | 0.27 |
| Gunnison | 17296 | 0.30 |
| Hinsdale | 772 | 0.01 |
| Huerfano | 6931 | 0.12 |
| Jackson | 1358 | 0.02 |
| Jefferson | 580854 | 9.99 |
| Kiowa | 1451 | 0.03 |
| Kit Carson | 6928 | 0.12 |
| Lake | 7400 | 0.13 |
| La Plata | 56177 | 0.97 |
| Larimer | 362785 | 6.24 |
| Las Animas | 14341 | 0.25 |
| Lincoln | 5473 | 0.09 |
| Logan | 21008 | 0.36 |
| Mesa | 157458 | 2.71 |
| Mineral | 925 | 0.02 |
| Moffat | 13166 | 0.23 |
| Montezuma | 26238 | 0.45 |
| Montrose | 43243 | 0.74 |
| Morgan | 29018 | 0.50 |
| Otero | 18530 | 0.32 |
| Ouray | 5064 | 0.09 |
| Park | 17747 | 0.31 |
| Phillips | 4508 | 0.08 |
| Pitkin | 17349 | 0.30 |
| Prowers | 11948 | 0.21 |
| Pueblo | 169354 | 2.91 |
| Rio Blanco | 6447 | 0.11 |
| Rio Grande | 11409 | 0.20 |
| Routt | 25069 | 0.43 |
| Saguache | 6517 | 0.11 |
| San Juan | 738 | 0.01 |
| San Miguel | 8082 | 0.14 |
| Sedgwick | 2328 | 0.04 |
| Summit | 31235 | 0.54 |
| Teller | 24951 | 0.43 |
| Washington | 4869 | 0.08 |
| Weld | 339942 | 5.85 |
| Yuma | 9926 | 0.17 |