Pennsylvania Population By County in 2015
Updated on June 16, 2025.
Based on the US Census Vintage data estimates, in 2015, the population of Pennsylvania was 12,789,838. Among all Pennsylvania counties, Philadelphia had the highest population (1,571,679), followed by Allegheny (1,229,342), and Montgomery (817,432). Cameron was the least populated county (4,773).
Hover over or click on the counties in the map below to see the populations. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.
You can see similar information for other states and by state for the United States.
Related Topics: Pennsylvania Census Vintage Data Topic List.
Data Source: US Census Bureau (Vintage).
See this for other years:
Pennsylvania Population By County in 2015
Pennsylvania Population By County in 2015
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| County | Population | % of State Population |
|---|---|---|
| Adams | 101847 | 0.80 |
| Allegheny | 1229342 | 9.61 |
| Armstrong | 66913 | 0.52 |
| Beaver | 168311 | 1.32 |
| Bedford | 48748 | 0.38 |
| Berks | 415218 | 3.25 |
| Blair | 124637 | 0.98 |
| Bradford | 61656 | 0.48 |
| Bucks | 625670 | 4.89 |
| Butler | 186046 | 1.46 |
| Cambria | 136083 | 1.06 |
| Cameron | 4773 | 0.04 |
| Carbon | 63766 | 0.50 |
| Centre | 160641 | 1.26 |
| Chester | 515098 | 4.03 |
| Clarion | 38889 | 0.30 |
| Clearfield | 80735 | 0.63 |
| Clinton | 39402 | 0.31 |
| Columbia | 66704 | 0.52 |
| Crawford | 86540 | 0.68 |
| Cumberland | 245891 | 1.92 |
| Dauphin | 273195 | 2.14 |
| Delaware | 563434 | 4.41 |
| Elk | 30898 | 0.24 |
| Erie | 278452 | 2.18 |
| Fayette | 133272 | 1.04 |
| Forest | 7386 | 0.06 |
| Franklin | 153131 | 1.20 |
| Fulton | 14510 | 0.11 |
| Greene | 37431 | 0.29 |
| Huntingdon | 45514 | 0.36 |
| Indiana | 86800 | 0.68 |
| Jefferson | 44350 | 0.35 |
| Juniata | 24442 | 0.19 |
| Lackawanna | 211974 | 1.66 |
| Lancaster | 535960 | 4.19 |
| Lawrence | 88154 | 0.69 |
| Lebanon | 137492 | 1.08 |
| Lehigh | 359689 | 2.81 |
| Luzerne | 318203 | 2.49 |
| Lycoming | 115644 | 0.90 |
| McKean | 42424 | 0.33 |
| Mercer | 113684 | 0.89 |
| Mifflin | 46435 | 0.36 |
| Monroe | 166602 | 1.30 |
| Montgomery | 817432 | 6.39 |
| Montour | 18297 | 0.14 |
| Northampton | 300264 | 2.35 |
| Northumberland | 92895 | 0.73 |
| Perry | 45849 | 0.36 |
| Philadelphia | 1571679 | 12.29 |
| Pike | 55410 | 0.43 |
| Potter | 17078 | 0.13 |
| Schuylkill | 144136 | 1.13 |
| Snyder | 40530 | 0.32 |
| Somerset | 75404 | 0.59 |
| Sullivan | 6266 | 0.05 |
| Susquehanna | 41778 | 0.33 |
| Tioga | 41562 | 0.33 |
| Union | 45573 | 0.36 |
| Venango | 52962 | 0.41 |
| Warren | 40346 | 0.32 |
| Washington | 207824 | 1.63 |
| Wayne | 51828 | 0.41 |
| Westmoreland | 357006 | 2.79 |
| Wyoming | 27822 | 0.22 |
| York | 441911 | 3.46 |