Ranking of Colorado Counties By Total Voting-age Population (18yrs and over) from Census 2020
Updated on February 22, 2026.
According to the data from the US 2020 Census, as at April 2020, among all the counties in Colorado, Denver County had the highest voting-age population (18 years and over) (581.06K), followed by El Paso County (558.71K), and Arapahoe County (501.68K).
The chart below shows the top 10 counties with high voting-age population, and the table below shows the ranking of all Colorado counties based on voting-age population.
You can also see the ranking of counties by population for other states as well as for the whole United States.
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Related Topics: Colorado Census 2020 Topic List.
Data Source: US Census Bureau, 2020 Census.
Ranking of Colorado Counties By Total Voting-age Population from Census 2020
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| Rank | County | Voting-age Population |
|---|---|---|
| 1 | Denver County | 581062 |
| 2 | El Paso County | 558711 |
| 3 | Arapahoe County | 501680 |
| 4 | Jefferson County | 469066 |
| 5 | Adams County | 386271 |
| 6 | Larimer County | 289333 |
| 7 | Boulder County | 268640 |
| 8 | Douglas County | 266006 |
| 9 | Weld County | 241833 |
| 10 | Pueblo County | 130863 |
| 11 | Mesa County | 123055 |
| 12 | Broomfield County | 57916 |
| 13 | Garfield County | 46166 |
| 14 | La Plata County | 45269 |
| 15 | Eagle County | 43263 |
| 16 | Fremont County | 41204 |
| 17 | Montrose County | 33608 |
| 18 | Summit County | 25853 |
| 19 | Delta County | 24993 |
| 20 | Morgan County | 21390 |
| 21 | Teller County | 20544 |
| 22 | Montezuma County | 20464 |
| 23 | Elbert County | 20395 |
| 24 | Routt County | 20060 |
| 25 | Logan County | 17431 |
| 26 | Chaffee County | 16471 |
| 27 | Park County | 14595 |
| 28 | Pitkin County | 14481 |
| 29 | Otero County | 14318 |
| 30 | Gunnison County | 14028 |
| 31 | Grand County | 13090 |
| 32 | Alamosa County | 12544 |
| 33 | Las Animas County | 12044 |
| 34 | Archuleta County | 10948 |
| 35 | Moffat County | 9993 |
| 36 | Prowers County | 8960 |
| 37 | Rio Grande County | 8959 |
| 38 | Clear Creek County | 8011 |
| 39 | Yuma County | 7320 |
| 40 | San Miguel County | 6515 |
| 41 | Lake County | 5884 |
| 42 | Huerfano County | 5722 |
| 43 | Conejos County | 5515 |
| 44 | Kit Carson County | 5305 |
| 45 | Crowley County | 5284 |
| 46 | Saguache County | 5096 |
| 47 | Gilpin County | 4916 |
| 48 | Rio Blanco County | 4889 |
| 49 | Bent County | 4745 |
| 50 | Lincoln County | 4485 |
| 51 | Ouray County | 4183 |
| 52 | Custer County | 3996 |
| 53 | Washington County | 3722 |
| 54 | Phillips County | 3401 |
| 55 | Costilla County | 2879 |
| 56 | Baca County | 2753 |
| 57 | Dolores County | 1924 |
| 58 | Sedgwick County | 1920 |
| 59 | Cheyenne County | 1338 |
| 60 | Jackson County | 1137 |
| 61 | Kiowa County | 1099 |
| 62 | Mineral County | 773 |
| 63 | Hinsdale County | 657 |
| 64 | San Juan County | 600 |
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