Pennsylvania Population By County in 2021 (ACS-5Yrs)
Updated on February 28, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, the total population of Pennsylvania was 12.97M. Among all Pennsylvania counties, Philadelphia was the most populated county (1.60M), followed by Allegheny (1.25M), and then Montgomery (850.89K).
On the other hand, the least populated counties were: Cameron (4.60K), Sullivan (5.94K), and Forest (7.12K).
The chart and table below shows the population of each county and the percentage of Pennsylvania population in each county.
You can see similar information for other states and by state for the United States.
Related Topics: Pennsylvania ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates, 2021 Census.
Pennsylvania Population By County in 2021
Pennsylvania Population By County in 2021
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| County | Population | % of State Population |
|---|---|---|
| Adams | 103782 | 0.80 |
| Allegheny | 1246116 | 9.61 |
| Armstrong | 65967 | 0.51 |
| Beaver | 168260 | 1.30 |
| Bedford | 47729 | 0.37 |
| Berks | 426967 | 3.29 |
| Blair | 123132 | 0.95 |
| Bradford | 60233 | 0.46 |
| Bucks | 643872 | 4.96 |
| Butler | 192561 | 1.49 |
| Cambria | 134048 | 1.03 |
| Cameron | 4596 | 0.04 |
| Carbon | 64792 | 0.50 |
| Centre | 158879 | 1.23 |
| Chester | 531704 | 4.10 |
| Clarion | 37571 | 0.29 |
| Clearfield | 80667 | 0.62 |
| Clinton | 37824 | 0.29 |
| Columbia | 65013 | 0.50 |
| Crawford | 84495 | 0.65 |
| Cumberland | 257333 | 1.98 |
| Dauphin | 284199 | 2.19 |
| Delaware | 573883 | 4.42 |
| Elk | 31037 | 0.24 |
| Erie | 271903 | 2.10 |
| Fayette | 129443 | 1.00 |
| Forest | 7121 | 0.06 |
| Franklin | 155592 | 1.20 |
| Fulton | 14529 | 0.11 |
| Greene | 36248 | 0.28 |
| Huntingdon | 44458 | 0.34 |
| Indiana | 83620 | 0.65 |
| Jefferson | 44491 | 0.34 |
| Juniata | 23607 | 0.18 |
| Lackawanna | 215529 | 1.66 |
| Lancaster | 550480 | 4.24 |
| Lawrence | 86311 | 0.67 |
| Lebanon | 142486 | 1.10 |
| Lehigh | 372492 | 2.87 |
| Luzerne | 324825 | 2.50 |
| Lycoming | 114274 | 0.88 |
| McKean | 40652 | 0.31 |
| Mercer | 111216 | 0.86 |
| Mifflin | 46156 | 0.36 |
| Monroe | 168128 | 1.30 |
| Montgomery | 850890 | 6.56 |
| Montour | 18198 | 0.14 |
| Northampton | 311359 | 2.40 |
| Northumberland | 91853 | 0.71 |
| Perry | 45879 | 0.35 |
| Philadelphia | 1596865 | 12.31 |
| Pike | 58345 | 0.45 |
| Potter | 16478 | 0.13 |
| Schuylkill | 143308 | 1.11 |
| Snyder | 39877 | 0.31 |
| Somerset | 74331 | 0.57 |
| Sullivan | 5935 | 0.05 |
| Susquehanna | 38892 | 0.30 |
| Tioga | 41089 | 0.32 |
| Union | 43094 | 0.33 |
| Venango | 50810 | 0.39 |
| Warren | 38791 | 0.30 |
| Washington | 209090 | 1.61 |
| Wayne | 51244 | 0.40 |
| Westmoreland | 355107 | 2.74 |
| Wyoming | 26389 | 0.20 |
| York | 454605 | 3.51 |
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