# Counties in Pennsylvania by population aged 18 to 64, 2025

All 67 values come from U.S. Census Bureau for 2025, so the places are comparable.

- Indicator id: `population_18_64_share`
- Unit: %
- Definition: Residents aged 18 to 64 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 18 to 64 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 18 to 64 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-18-64/pennsylvania-counties

| Rank | Place | % |
|---:|---|---:|
| 1 | Centre County | 68.1 |
| 2 | Forest County | 66.4 |
| 3 | Philadelphia County | 64.3 |
| 4 | Union County | 61.7 |
| 5 | Columbia County | 60.7 |
| 6 | Allegheny County | 60.3 |
| 7 | Northampton County | 59.6 |
| 8 | Monroe County | 59.6 |
| 9 | Dauphin County | 59.2 |
| 10 | Indiana County | 59.1 |
| 11 | Chester County | 59 |
| 12 | Cumberland County | 58.9 |
| 13 | Lehigh County | 58.9 |
| 14 | Delaware County | 58.8 |
| 15 | Berks County | 58.7 |
| 16 | Greene County | 58.5 |
| 17 | Montgomery County | 58.5 |
| 18 | Butler County | 58.5 |
| 19 | Erie County | 58.5 |
| 20 | York County | 58.3 |
| 21 | Luzerne County | 58.3 |
| 22 | Lackawanna County | 58.1 |
| 23 | McKean County | 58.1 |
| 24 | Clearfield County | 57.9 |
| 25 | Schuylkill County | 57.7 |
| 26 | Clinton County | 57.7 |
| 27 | Bucks County | 57.6 |
| 28 | Huntingdon County | 57.5 |
| 29 | Carbon County | 57.4 |
| 30 | Snyder County | 57.3 |
| 31 | Lycoming County | 57.3 |
| 32 | Wyoming County | 57.3 |
| 33 | Clarion County | 57.1 |
| 34 | Adams County | 56.9 |
| 35 | Washington County | 56.8 |
| 36 | Beaver County | 56.7 |
| 37 | Northumberland County | 56.6 |
| 38 | Pike County | 56.6 |
| 39 | Wayne County | 56.6 |
| 40 | Fayette County | 56.5 |
| 41 | Franklin County | 56.4 |
| 42 | Blair County | 56.2 |
| 43 | Perry County | 56.1 |
| 44 | Lancaster County | 56.1 |
| 45 | Somerset County | 55.9 |
| 46 | Mercer County | 55.8 |
| 47 | Lebanon County | 55.8 |
| 48 | Fulton County | 55.8 |
| 49 | Westmoreland County | 55.8 |
| 50 | Elk County | 55.5 |
| 51 | Armstrong County | 55.4 |
| 52 | Juniata County | 55.4 |
| 53 | Cambria County | 55.4 |
| 54 | Lawrence County | 55.4 |
| 55 | Tioga County | 55.1 |
| 56 | Crawford County | 55 |
| 57 | Bradford County | 54.8 |
| 58 | Montour County | 54.8 |
| 59 | Mifflin County | 54.5 |
| 60 | Jefferson County | 54.5 |
| 61 | Warren County | 54.3 |
| 62 | Bedford County | 54.2 |
| 63 | Susquehanna County | 53.7 |
| 64 | Venango County | 53.6 |
| 65 | Potter County | 52.3 |
| 66 | Cameron County | 52.1 |
| 67 | Sullivan County | 52 |