# Counties in New Mexico by median age on 1 July (US county estimates), 2025

All 33 values come from U.S. Census Bureau for 2025, so the places are comparable.

- Indicator id: `median_age_pep`
- Unit: years
- Definition: Age that divides the resident population of a US county into two halves of equal size on 1 July, from Census Bureau population estimates calculated by single year of age.
- Source: U.S. Census Bureau, Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage (https://www.census.gov/programs-surveys/popest/data/data-sets.html)
- Publisher page: https://invokely.ai/en/publishers/us-census-bureau
- Retrieved: 2026-10-12
- Citation: U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.
- Web page: https://invokely.ai/rankings/median-age-july-1-us-counties/new-mexico-counties

| Rank | Place | years |
|---:|---|---:|
| 1 | Catron County | 63.3 |
| 2 | Harding County | 58.6 |
| 3 | Sierra County | 57.1 |
| 4 | Mora County | 55.6 |
| 5 | Lincoln County | 53.8 |
| 6 | Taos County | 52 |
| 7 | Grant County | 50.8 |
| 8 | Colfax County | 49.7 |
| 9 | Santa Fe County | 49.2 |
| 10 | De Baca County | 48.9 |
| 11 | Quay County | 47 |
| 12 | San Miguel County | 45.4 |
| 13 | Hidalgo County | 44.3 |
| 14 | Torrance County | 44 |
| 14 | Union County | 44 |
| 16 | Rio Arriba County | 43.7 |
| 17 | Guadalupe County | 42.1 |
| 18 | Sandoval County | 41.9 |
| 19 | Los Alamos County | 40.7 |
| 20 | Socorro County | 40.3 |
| 21 | Bernalillo County | 40.2 |
| 22 | Valencia County | 39.5 |
| 23 | Luna County | 38.6 |
| 24 | Cibola County | 38.5 |
| 25 | San Juan County | 38.2 |
| 26 | Otero County | 37.6 |
| 27 | Chaves County | 36.8 |
| 28 | McKinley County | 36.7 |
| 29 | Doña Ana County | 36.3 |
| 29 | Eddy County | 36.3 |
| 31 | Lea County | 32.9 |
| 32 | Curry County | 32.3 |
| 33 | Roosevelt County | 31.5 |