30 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Kingston | Luzerne County | 13,546 |
| Kennett | Chester County | 9,429 |
| Kennedy | Allegheny County | 8,373 |
| Kingston | Luzerne County | 7,307 |
| Kennett Square | Chester County | 7,101 |
| Kiskiminetas | Armstrong County | 4,435 |
| Kelly | Union County | 4,253 |
| Kutztown | Berks County | 4,243 |
| Kittanning | Armstrong County | 3,920 |
| Kane | McKean County | 3,418 |
| Kenhorst | Berks County | 3,052 |
| Kulpmont | Northumberland County | 2,669 |
| Keating | McKean County | 2,649 |
| Kittanning | Armstrong County | 1,979 |
| Kidder | Carbon County | 1,876 |
| Kimmel | Bedford County | 1,534 |
| Kline | Schuylkill County | 1,496 |
| King | Bedford County | 1,179 |
| Knox | Clarion County | 1,062 |
| Knox | Clarion County | 985 |
| Knox | Clarion County | 969 |
| Kilbuck | Allegheny County | 738 |
| Karthaus | Clearfield County | 711 |
| Koppel | Beaver County | 687 |
| Knoxville | Tioga County | 661 |
| Knox | Clarion County | 574 |
| Kistler | Huntingdon County | 280 |
| Keating | Potter County | 278 |
| Kingsley | Susquehanna County | 243 |
| Karns City | Butler County | 163 |