30 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Kingston | Luzerne County | 13,511 |
| Kennett | Chester County | 9,357 |
| Kennedy | Allegheny County | 8,406 |
| Kingston | Luzerne County | 7,259 |
| Kennett Square | Chester County | 6,907 |
| Kiskiminetas | Armstrong County | 4,466 |
| Kutztown | Berks County | 4,228 |
| Kelly | Union County | 4,038 |
| Kittanning | Armstrong County | 3,920 |
| Kane | McKean County | 3,453 |
| Kenhorst | Berks County | 3,043 |
| Kulpmont | Northumberland County | 2,683 |
| Keating | McKean County | 2,653 |
| Kittanning | Armstrong County | 1,982 |
| Kidder | Carbon County | 1,863 |
| Kimmel | Bedford County | 1,529 |
| Kline | Schuylkill County | 1,490 |
| King | Bedford County | 1,177 |
| Knox | Clarion County | 1,068 |
| Knox | Clarion County | 982 |
| Knox | Clarion County | 976 |
| Kilbuck | Allegheny County | 742 |
| Karthaus | Clearfield County | 726 |
| Koppel | Beaver County | 690 |
| Knoxville | Tioga County | 664 |
| Knox | Clarion County | 577 |
| Kistler | Huntingdon County | 282 |
| Keating | Potter County | 280 |
| Kingsley | Susquehanna County | 248 |
| Karns City | Butler County | 164 |