# Counties in Utah by population under 18, 2025

All 29 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/utah-counties

| Rank | Place | % |
|---:|---|---:|
| 1 | Juab County | 32.6 |
| 2 | Morgan County | 30.1 |
| 3 | Tooele County | 29.9 |
| 4 | Duchesne County | 29.9 |
| 5 | Utah County | 29.8 |
| 6 | Uintah County | 29.2 |
| 7 | Box Elder County | 28.6 |
| 8 | Millard County | 28.4 |
| 9 | Davis County | 28.2 |
| 10 | Beaver County | 28.1 |
| 11 | Sevier County | 27.2 |
| 12 | Cache County | 27.2 |
| 13 | Rich County | 27 |
| 14 | Emery County | 26.9 |
| 15 | San Juan County | 26.7 |
| 16 | Wasatch County | 25.9 |
| 17 | Iron County | 25.3 |
| 18 | Weber County | 25 |
| 19 | Sanpete County | 24.9 |
| 20 | Carbon County | 23.9 |
| 21 | Washington County | 23.8 |
| 22 | Salt Lake County | 23.2 |
| 23 | Wayne County | 22.8 |
| 24 | Summit County | 21.6 |
| 25 | Kane County | 21.5 |
| 26 | Garfield County | 20.9 |
| 27 | Daggett County | 20.8 |
| 28 | Piute County | 20.6 |
| 29 | Grand County | 19.3 |