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

All 67 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/pennsylvania-counties

| Rank | Place | years |
|---:|---|---:|
| 1 | Sullivan County | 55.7 |
| 2 | Cameron County | 52.8 |
| 3 | Potter County | 50 |
| 4 | Pike County | 49.1 |
| 4 | Wayne County | 49.1 |
| 6 | Elk County | 48.6 |
| 7 | Venango County | 47.6 |
| 8 | Armstrong County | 47.5 |
| 9 | Bedford County | 47.4 |
| 9 | Westmoreland County | 47.4 |
| 11 | Warren County | 47.3 |
| 12 | Somerset County | 47.1 |
| 12 | Susquehanna County | 47.1 |
| 14 | Clearfield County | 46.5 |
| 15 | Carbon County | 46.3 |
| 16 | Fayette County | 46.2 |
| 16 | Forest County | 46.2 |
| 18 | Cambria County | 46 |
| 19 | Fulton County | 45.8 |
| 20 | Beaver County | 45.2 |
| 20 | Tioga County | 45.2 |
| 22 | Lawrence County | 45.1 |
| 23 | Jefferson County | 45 |
| 23 | Mercer County | 45 |
| 23 | Wyoming County | 45 |
| 26 | Washington County | 44.9 |
| 27 | Adams County | 44.8 |
| 27 | Bucks County | 44.8 |
| 27 | Greene County | 44.8 |
| 30 | Crawford County | 44.6 |
| 30 | Huntingdon County | 44.6 |
| 32 | Blair County | 44.4 |
| 32 | Monroe County | 44.4 |
| 34 | McKean County | 44.2 |
| 35 | Northumberland County | 44.1 |
| 35 | Schuylkill County | 44.1 |
| 37 | Butler County | 43.9 |
| 37 | Perry County | 43.9 |
| 39 | Montour County | 43.7 |
| 40 | Bradford County | 43.6 |
| 41 | Juniata County | 43 |
| 41 | Mifflin County | 43 |
| 43 | Clarion County | 42.7 |
| 44 | Luzerne County | 42.4 |
| 45 | Lackawanna County | 42.3 |
| 45 | Northampton County | 42.3 |
| 47 | Lycoming County | 42.1 |
| 47 | Montgomery County | 42.1 |
| 49 | Franklin County | 42 |
| 49 | Lebanon County | 42 |
| 51 | York County | 41.5 |
| 52 | Erie County | 41.3 |
| 53 | Chester County | 41.2 |
| 54 | Snyder County | 41 |
| 55 | Allegheny County | 40.8 |
| 56 | Clinton County | 40.7 |
| 56 | Indiana County | 40.7 |
| 58 | Columbia County | 40.6 |
| 59 | Cumberland County | 40.5 |
| 60 | Berks County | 40.3 |
| 60 | Lehigh County | 40.3 |
| 62 | Dauphin County | 40 |
| 63 | Delaware County | 39.9 |
| 63 | Lancaster County | 39.9 |
| 65 | Union County | 39.5 |
| 66 | Philadelphia County | 35.7 |
| 67 | Centre County | 34 |