# Counties in Pennsylvania by population under 18, 2025

All 67 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/pennsylvania-counties

| Rank | Place | % |
|---:|---|---:|
| 1 | Lancaster County | 22.3 |
| 2 | Mifflin County | 22.2 |
| 3 | Juniata County | 22 |
| 4 | Lebanon County | 21.6 |
| 5 | Delaware County | 21.6 |
| 6 | Franklin County | 21.5 |
| 7 | Bradford County | 21.5 |
| 8 | Lehigh County | 21.3 |
| 9 | Berks County | 21.3 |
| 10 | York County | 21.2 |
| 11 | Dauphin County | 21.1 |
| 12 | Chester County | 21.1 |
| 13 | Perry County | 21.1 |
| 14 | Snyder County | 20.5 |
| 15 | Jefferson County | 20.5 |
| 16 | Crawford County | 20.3 |
| 17 | Montgomery County | 20.2 |
| 18 | Cumberland County | 20.1 |
| 19 | Luzerne County | 20 |
| 20 | Clinton County | 19.9 |
| 21 | Fulton County | 19.9 |
| 22 | Philadelphia County | 19.9 |
| 23 | Lycoming County | 19.8 |
| 24 | Northumberland County | 19.7 |
| 25 | Lackawanna County | 19.6 |
| 26 | Montour County | 19.6 |
| 27 | Erie County | 19.6 |
| 28 | Clarion County | 19.6 |
| 29 | Susquehanna County | 19.5 |
| 30 | Bedford County | 19.4 |
| 31 | Tioga County | 19.3 |
| 32 | Schuylkill County | 19.3 |
| 33 | Bucks County | 19.3 |
| 34 | Blair County | 19.3 |
| 35 | Warren County | 19.3 |
| 36 | Lawrence County | 19.3 |
| 37 | Venango County | 19.2 |
| 38 | Potter County | 18.9 |
| 39 | Mercer County | 18.9 |
| 40 | Washington County | 18.8 |
| 41 | Monroe County | 18.7 |
| 42 | McKean County | 18.7 |
| 43 | Beaver County | 18.4 |
| 44 | Fayette County | 18.4 |
| 45 | Cambria County | 18.4 |
| 46 | Wyoming County | 18.4 |
| 47 | Adams County | 18.4 |
| 48 | Butler County | 18.4 |
| 49 | Carbon County | 18.3 |
| 50 | Armstrong County | 18.2 |
| 51 | Northampton County | 18.2 |
| 52 | Indiana County | 18.1 |
| 53 | Elk County | 18.1 |
| 54 | Huntingdon County | 17.9 |
| 55 | Allegheny County | 17.8 |
| 56 | Greene County | 17.8 |
| 57 | Somerset County | 17.7 |
| 58 | Westmoreland County | 17.6 |
| 59 | Clearfield County | 17.5 |
| 60 | Pike County | 17.3 |
| 61 | Columbia County | 17.3 |
| 61 | Union County | 17.3 |
| 63 | Cameron County | 16.6 |
| 64 | Wayne County | 16.2 |
| 65 | Centre County | 14.3 |
| 66 | Sullivan County | 13.2 |
| 67 | Forest County | 7.8 |