# Counties in Pennsylvania by population, 2025

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

- Indicator id: `population`
- Unit: persons
- Definition: Resident population. Spain and the EU: 1 January, with Spanish figures from the official municipal register (Padrón). United States: Census Bureau population estimates for 1 July. Other countries and the World: World Bank mid-year estimates, which count all residents regardless of legal status or citizenship.
- Source: U.S. Census Bureau, Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program) (https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/)
- Retrieved: 2026-10-08
- Citation: U.S. Census Bureau. Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-08.
- Web page: https://invokely.ai/rankings/population/pennsylvania-counties
- CSV: https://invokely.ai/download/rankings/population/pennsylvania-counties.csv

| Rank | Place | persons |
|---:|---|---:|
| 1 | Philadelphia County | 1,574,281 |
| 2 | Allegheny County | 1,225,035 |
| 3 | Montgomery County | 877,643 |
| 4 | Bucks County | 647,828 |
| 5 | Delaware County | 580,937 |
| 6 | Lancaster County | 563,159 |
| 7 | Chester County | 557,116 |
| 8 | York County | 473,197 |
| 9 | Berks County | 440,072 |
| 10 | Lehigh County | 384,383 |
| 11 | Westmoreland County | 349,324 |
| 12 | Luzerne County | 332,126 |
| 13 | Northampton County | 324,411 |
| 14 | Dauphin County | 293,351 |
| 15 | Cumberland County | 277,270 |
| 16 | Erie County | 265,832 |
| 17 | Lackawanna County | 216,502 |
| 18 | Washington County | 210,802 |
| 19 | Butler County | 200,169 |
| 20 | Monroe County | 167,179 |
| 21 | Beaver County | 166,032 |
| 22 | Franklin County | 160,652 |
| 23 | Centre County | 157,393 |
| 24 | Lebanon County | 146,380 |
| 25 | Schuylkill County | 145,085 |
| 26 | Cambria County | 128,968 |
| 27 | Fayette County | 123,021 |
| 28 | Blair County | 119,541 |
| 29 | Lycoming County | 112,587 |
| 30 | Mercer County | 107,860 |
| 31 | Adams County | 107,594 |
| 32 | Northumberland County | 89,920 |
| 33 | Lawrence County | 83,911 |
| 34 | Indiana County | 82,878 |
| 35 | Crawford County | 81,792 |
| 36 | Clearfield County | 78,100 |
| 37 | Somerset County | 72,004 |
| 38 | Columbia County | 66,193 |
| 39 | Carbon County | 65,868 |
| 40 | Armstrong County | 63,698 |
| 41 | Pike County | 62,808 |
| 42 | Bradford County | 59,600 |
| 43 | Wayne County | 51,703 |
| 44 | Venango County | 49,346 |
| 45 | Bedford County | 47,480 |
| 46 | Perry County | 46,806 |
| 47 | Mifflin County | 46,127 |
| 48 | Jefferson County | 43,255 |
| 49 | Huntingdon County | 43,001 |
| 50 | Union County | 42,313 |
| 51 | Tioga County | 40,502 |
| 52 | Snyder County | 39,655 |
| 53 | McKean County | 38,984 |
| 54 | Susquehanna County | 38,237 |
| 55 | Clinton County | 37,870 |
| 56 | Warren County | 37,038 |
| 57 | Clarion County | 36,680 |
| 58 | Greene County | 33,885 |
| 59 | Elk County | 29,926 |
| 60 | Wyoming County | 25,790 |
| 61 | Juniata County | 23,403 |
| 62 | Montour County | 17,868 |
| 63 | Potter County | 15,897 |
| 64 | Fulton County | 14,483 |
| 65 | Forest County | 6,614 |
| 66 | Sullivan County | 5,856 |
| 67 | Cameron County | 4,211 |