Fastest growing counties in Pennsylvania.
County | Rank | Change (2020) | 2024 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Pike County | 1 | 5.71% | 61,918 | 58,574 |
| Cumberland County | 2 | 4.87% | 272,944 | 260,258 |
| Adams County | 3 | 3.6% | 107,537 | 103,798 |
| Chester County | 4 | 3.38% | 552,930 | 534,830 |
| Butler County | 5 | 2.77% | 199,458 | 194,077 |
| York County | 6 | 2.52% | 468,231 | 456,720 |
| Northampton County | 7 | 2.4% | 320,282 | 312,784 |
| Montgomery County | 8 | 1.8% | 872,440 | 856,998 |
| Franklin County | 9 | 1.8% | 158,757 | 155,949 |
| Columbia County | 10 | 1.4% | 65,589 | 64,686 |
| Lancaster County | 11 | 1.39% | 560,518 | 552,821 |
| Lehigh County | 12 | 1.26% | 379,234 | 374,501 |
| Berks County | 13 | 1.26% | 434,069 | 428,671 |
| Dauphin County | 14 | 1.07% | 289,781 | 286,710 |
| Carbon County | 15 | 1.04% | 65,423 | 64,752 |
| Schuylkill County | 16 | 0.99% | 144,384 | 142,963 |
| Luzerne County | 17 | 0.94% | 328,280 | 325,217 |
| Lebanon County | 18 | 0.92% | 144,602 | 143,278 |
| Wayne County | 19 | 0.56% | 51,440 | 51,151 |
| Washington County | 20 | 0.52% | 210,524 | 209,434 |
| Perry County | 21 | 0.5% | 46,053 | 45,825 |
| Snyder County | 22 | 0.49% | 39,928 | 39,733 |
| Lackawanna County | 23 | 0.44% | 216,496 | 215,539 |
| Delaware County | 24 | 0.21% | 577,567 | 576,356 |
| Clinton County | 25 | 0.18% | 37,438 | 37,370 |
| Centre County | 26 | 0.05% | 158,057 | 157,979 |
| Bucks County | 27 | 0.04% | 646,411 | 646,173 |
| Indiana County | 28 | -0.03% | 83,124 | 83,151 |
| Sullivan County | 29 | -0.09% | 5,823 | 5,828 |
| Mifflin County | 30 | -0.6% | 45,860 | 46,137 |
| Bedford County | 31 | -0.61% | 47,279 | 47,568 |
| Susquehanna County | 32 | -0.7% | 38,079 | 38,346 |
| Bradford County | 33 | -0.72% | 59,536 | 59,968 |
| Huntingdon County | 34 | -0.72% | 43,731 | 44,049 |
| Tioga County | 35 | -0.76% | 40,713 | 41,025 |
| Wyoming County | 36 | -0.97% | 25,780 | 26,032 |
| Westmoreland County | 37 | -1.13% | 350,328 | 354,346 |
| Juniata County | 38 | -1.19% | 23,205 | 23,484 |
| Clarion County | 39 | -1.31% | 36,713 | 37,199 |
| Fulton County | 40 | -1.35% | 14,382 | 14,579 |
| Beaver County | 41 | -1.4% | 165,525 | 167,873 |
| Lycoming County | 42 | -1.5% | 112,414 | 114,125 |
| Northumberland County | 43 | -1.56% | 90,117 | 91,545 |
| Erie County | 44 | -1.58% | 266,302 | 270,578 |
| Lawrence County | 45 | -2.14% | 84,132 | 85,970 |
| Monroe County | 46 | -2.17% | 164,655 | 168,314 |
| Jefferson County | 47 | -2.23% | 43,493 | 44,487 |
| Blair County | 48 | -2.33% | 119,812 | 122,666 |
| Mercer County | 49 | -2.43% | 107,869 | 110,550 |
| Venango County | 50 | -2.46% | 49,128 | 50,365 |
| Cambria County | 51 | -2.48% | 129,907 | 133,211 |
| Montour County | 52 | -2.56% | 17,666 | 18,131 |
| Allegheny County | 53 | -2.6% | 1,217,045 | 1,249,565 |
| Crawford County | 54 | -2.64% | 81,597 | 83,807 |
| McKean County | 55 | -2.92% | 39,219 | 40,399 |
| Union County | 56 | -2.94% | 41,394 | 42,646 |
| Somerset County | 57 | -3.05% | 71,765 | 74,019 |
| Warren County | 58 | -3.08% | 37,326 | 38,511 |
| Armstrong County | 59 | -3.09% | 63,444 | 65,470 |
| Elk County | 60 | -3.29% | 29,929 | 30,946 |
| Potter County | 61 | -3.61% | 15,792 | 16,383 |
| Cameron County | 62 | -3.82% | 4,354 | 4,527 |
| Philadelphia County | 63 | -4.15% | 1,534,248 | 1,600,684 |
| Greene County | 64 | -4.69% | 34,185 | 35,868 |
| Fayette County | 65 | -4.76% | 122,462 | 128,588 |
| Clearfield County | 66 | -5.07% | 76,356 | 80,432 |
| Forest County | 67 | -9.53% | 6,295 | 6,958 |