Pennsylvania Counties by Population (2026)
2026 Pop.
200K
400K
600K
800K
1M
1.2M
1.4M
Top 5 Most Populous Counties
1,575,827
1,222,896
880,126
647,240
580,458
| County | 2026 Pop. ↓ | Area (mi²) | Density (/mi²) | Change (2020) |
|---|---|---|---|---|
| Philadelphia County | 1,575,827 | 134 | 11,760 | -1.56% |
| Allegheny County | 1,222,896 | 730 | 1,675 | -2.14% |
| Montgomery County | 880,126 | 483 | 1,822 | 2.72% |
| Bucks County | 647,240 | 604 | 1,072 | 0.16% |
| Delaware County | 580,458 | 184 | 3,155 | 0.69% |
| Lancaster County | 564,256 | 944 | 598 | 2.07% |
| Chester County | 559,702 | 751 | 745 | 4.64% |
| York County | 476,408 | 904 | 527 | 4.31% |
| Berks County | 441,765 | 856 | 516 | 3.06% |
| Lehigh County | 385,827 | 345 | 1,118 | 3.04% |
| Westmoreland County | 348,175 | 1K | 339 | -1.72% |
| Luzerne County | 333,354 | 890 | 375 | 2.51% |
| Northampton County | 325,737 | 370 | 880 | 4.13% |
| Dauphin County | 293,785 | 525 | 560 | 2.47% |
| Cumberland County | 279,884 | 545 | 514 | 7.54% |
| Erie County | 265,229 | 799 | 332 | -2.03% |
| Lackawanna County | 216,586 | 459 | 472 | 0.49% |
| Washington County | 210,969 | 857 | 246 | 0.74% |
| Butler County | 201,038 | 789 | 255 | 3.61% |
| Monroe County | 167,540 | 608 | 276 | -0.46% |
| Beaver County | 166,295 | 435 | 382 | -0.93% |
| Franklin County | 161,828 | 772 | 210 | 3.78% |
| Centre County | 156,281 | 1.1K | 141 | -1.11% |
| Lebanon County | 147,368 | 362 | 407 | 2.86% |
| Schuylkill County | 145,761 | 779 | 187 | 1.97% |
| Cambria County | 128,031 | 688 | 186 | -3.88% |
| Fayette County | 122,083 | 791 | 154 | -5.06% |
| Blair County | 119,031 | 525 | 227 | -2.96% |
| Lycoming County | 112,256 | 1.2K | 91 | -1.63% |
| Adams County | 108,033 | 519 | 208 | 4.06% |
| Mercer County | 107,482 | 673 | 160 | -2.78% |
| Northumberland County | 89,871 | 458 | 196 | -1.83% |
| Lawrence County | 83,735 | 357 | 235 | -2.59% |
| Indiana County | 82,499 | 827 | 100 | -0.79% |
| Crawford County | 81,638 | 1K | 81 | -2.58% |
| Clearfield County | 78,069 | 1.1K | 68 | -2.93% |
| Somerset County | 71,799 | 1.1K | 67 | -2.97% |
| Columbia County | 66,389 | 483 | 137 | 2.64% |
| Carbon County | 66,027 | 381 | 173 | 1.95% |
| Armstrong County | 63,641 | 653 | 97 | -2.83% |
| Pike County | 63,352 | 545 | 116 | 8.12% |
| Bradford County | 59,607 | 1.1K | 52 | -0.61% |
| Wayne County | 52,044 | 726 | 72 | 1.75% |
| Venango County | 49,174 | 674 | 73 | -2.37% |
| Bedford County | 47,394 | 1K | 47 | -0.37% |
| Perry County | 47,046 | 551 | 85 | 2.65% |
| Mifflin County | 46,231 | 411 | 112 | 0.19% |
| Jefferson County | 43,170 | 652 | 66 | -2.96% |
| Huntingdon County | 42,618 | 875 | 49 | -3.24% |
| Union County | 41,985 | 316 | 133 | -1.58% |
| Tioga County | 40,441 | 1.1K | 36 | -1.42% |
| Snyder County | 39,621 | 329 | 120 | -0.29% |
| McKean County | 38,679 | 980 | 39 | -4.27% |
| Susquehanna County | 38,294 | 823 | 47 | -0.16% |
| Clinton County | 37,933 | 890 | 43 | 1.48% |
| Warren County | 36,765 | 884 | 42 | -4.54% |
| Clarion County | 36,619 | 601 | 61 | -1.56% |
| Greene County | 33,628 | 576 | 58 | -6.25% |
| Elk County | 29,785 | 827 | 36 | -3.73% |
| Wyoming County | 25,723 | 397 | 65 | -1.19% |
| Juniata County | 23,352 | 391 | 60 | -0.53% |
| Montour County | 17,836 | 130 | 137 | -1.62% |
| Potter County | 15,784 | 1.1K | 15 | -3.69% |
| Fulton County | 14,476 | 438 | 33 | -0.7% |
| Forest County | 6,633 | 427 | 16 | -4.86% |
| Sullivan County | 5,817 | 450 | 13 | -0.1% |
| Cameron County | 4,090 | 396 | 10 | -9.69% |
Sources
- US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
- US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
- American Community Survey (2009 - 2013)
- Census QuickFacts
- Historical Populations of States and Counties (1790 - 1990)