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

All 16 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/maine-counties

| Rank | Place | years |
|---:|---|---:|
| 1 | Lincoln County | 52.9 |
| 2 | Piscataquis County | 51.4 |
| 3 | Knox County | 50.4 |
| 4 | Hancock County | 49.8 |
| 5 | Washington County | 49.1 |
| 6 | Aroostook County | 48.4 |
| 6 | Waldo County | 48.4 |
| 8 | Sagadahoc County | 47.5 |
| 9 | Franklin County | 47.4 |
| 9 | Oxford County | 47.4 |
| 11 | Somerset County | 46.6 |
| 12 | York County | 45.9 |
| 13 | Kennebec County | 43.9 |
| 14 | Cumberland County | 42.7 |
| 15 | Penobscot County | 42.2 |
| 16 | Androscoggin County | 40.4 |