# Counties in Maine by population under 18, 2025

All 16 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/maine-counties

| Rank | Place | % |
|---:|---|---:|
| 1 | Androscoggin County | 19.8 |
| 2 | Aroostook County | 18.6 |
| 3 | Somerset County | 18.3 |
| 4 | Washington County | 17.9 |
| 5 | Kennebec County | 17.8 |
| 6 | Oxford County | 17.7 |
| 7 | Piscataquis County | 17.2 |
| 8 | Cumberland County | 17.2 |
| 9 | Penobscot County | 17 |
| 10 | Waldo County | 17 |
| 11 | Sagadahoc County | 16.7 |
| 12 | York County | 16.7 |
| 13 | Lincoln County | 15.7 |
| 14 | Knox County | 15.6 |
| 15 | Hancock County | 15.1 |
| 16 | Franklin County | 14.9 |