# Counties in New Mexico by population under 18, 2025

All 33 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/new-mexico-counties

| Rank | Place | % |
|---:|---|---:|
| 1 | Lea County | 27.8 |
| 2 | Curry County | 26.2 |
| 3 | Luna County | 25 |
| 4 | Eddy County | 24.8 |
| 5 | McKinley County | 24.7 |
| 6 | Chaves County | 24.2 |
| 7 | San Juan County | 24 |
| 8 | Roosevelt County | 23.2 |
| 9 | Valencia County | 22.5 |
| 10 | Cibola County | 22.4 |
| 11 | Doña Ana County | 21.9 |
| 12 | Hidalgo County | 21.6 |
| 13 | Otero County | 21.2 |
| 14 | Sandoval County | 20.7 |
| 15 | Torrance County | 20.7 |
| 16 | Los Alamos County | 20.6 |
| 17 | Quay County | 20.4 |
| 18 | Rio Arriba County | 20.4 |
| 19 | Socorro County | 19.4 |
| 20 | Union County | 19.1 |
| 21 | Bernalillo County | 19.1 |
| 22 | De Baca County | 19 |
| 23 | Guadalupe County | 17.9 |
| 24 | San Miguel County | 17.3 |
| 25 | Grant County | 17.2 |
| 26 | Lincoln County | 16.5 |
| 27 | Colfax County | 16.4 |
| 28 | Mora County | 15.7 |
| 29 | Sierra County | 15.4 |
| 30 | Taos County | 15.1 |
| 31 | Santa Fe County | 14.9 |
| 32 | Harding County | 12.8 |
| 33 | Catron County | 10.9 |