# Counties in Arizona by population under 18, 2025

All 15 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/arizona-counties

| Rank | Place | % |
|---:|---|---:|
| 1 | Greenlee County | 26.4 |
| 2 | Graham County | 26.2 |
| 3 | Apache County | 24.4 |
| 4 | Navajo County | 24.4 |
| 5 | Yuma County | 24.3 |
| 6 | Santa Cruz County | 24.2 |
| 7 | Pinal County | 22 |
| 8 | Maricopa County | 21.7 |
| 9 | Cochise County | 19.5 |
| 10 | Pima County | 18.8 |
| 11 | Coconino County | 18.3 |
| 12 | Gila County | 18 |
| 13 | La Paz County | 17.3 |
| 14 | Mohave County | 15.9 |
| 15 | Yavapai County | 14.7 |