# Counties in Colorado by population under 18, 2025

All 64 values come from U.S. Census Bureau for 2025, so the places are comparable.

- Indicator id: `population_0_17_share`
- Unit: %
- Definition: Residents aged 0 to 17 as a percentage of total population on 1 July. United States: Census Bureau county population estimates by age; states and the nation are sums of their counties.
- Source: U.S. Census Bureau, Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties (https://www.census.gov/programs-surveys/popest/data/data-sets.html)
- Retrieved: 2026-10-12
- Citation: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.
- Web page: https://invokely.ai/rankings/population-under-18/colorado-counties

| Rank | Place | % |
|---:|---|---:|
| 1 | Yuma County | 27.2 |
| 2 | Morgan County | 26.4 |
| 3 | Conejos County | 26 |
| 4 | Prowers County | 25.4 |
| 5 | Weld County | 25.1 |
| 6 | Kit Carson County | 24.9 |
| 7 | Cheyenne County | 24.8 |
| 8 | Kiowa County | 24.7 |
| 9 | Phillips County | 24.6 |
| 10 | Adams County | 23.3 |
| 11 | Alamosa County | 23.1 |
| 12 | Garfield County | 22.8 |
| 13 | Moffat County | 22.8 |
| 14 | Washington County | 22.5 |
| 15 | Douglas County | 22.3 |
| 16 | Otero County | 22.3 |
| 17 | El Paso County | 22.2 |
| 18 | Arapahoe County | 22.1 |
| 19 | Baca County | 22 |
| 20 | Rio Blanco County | 21.4 |
| 21 | Elbert County | 21.3 |
| 22 | Pueblo County | 21 |
| 23 | Montezuma County | 20.3 |
| 24 | Lincoln County | 20.3 |
| 25 | Lake County | 20.3 |
| 26 | Rio Grande County | 19.9 |
| 27 | Sedgwick County | 19.5 |
| 28 | Montrose County | 19.2 |
| 29 | Mesa County | 19 |
| 30 | Eagle County | 18.8 |
| 31 | Delta County | 18.7 |
| 32 | Broomfield County | 18.7 |
| 33 | Costilla County | 18.6 |
| 34 | Logan County | 18.4 |
| 35 | Denver County | 18.3 |
| 36 | Saguache County | 18.1 |
| 37 | Routt County | 17.6 |
| 38 | Jefferson County | 17.5 |
| 39 | Larimer County | 17.4 |
| 40 | Archuleta County | 16.9 |
| 41 | La Plata County | 16.8 |
| 42 | Dolores County | 16.7 |
| 43 | Las Animas County | 16.5 |
| 44 | Boulder County | 16.3 |
| 45 | Custer County | 16 |
| 46 | Jackson County | 15.9 |
| 47 | Summit County | 15.9 |
| 48 | San Miguel County | 15.8 |
| 49 | Teller County | 15.6 |
| 50 | Gunnison County | 15.5 |
| 51 | Pitkin County | 15.5 |
| 52 | Hinsdale County | 15.3 |
| 53 | Grand County | 14.9 |
| 54 | Fremont County | 14.8 |
| 55 | Park County | 14.8 |
| 56 | Chaffee County | 14.7 |
| 57 | Bent County | 14.7 |
| 58 | Huerfano County | 14.5 |
| 59 | Gilpin County | 12.7 |
| 60 | Ouray County | 12.6 |
| 61 | Clear Creek County | 11.8 |
| 62 | San Juan County | 11.6 |
| 63 | Mineral County | 11.4 |
| 64 | Crowley County | 10 |