City | 2024 Population |
|---|---|
| Ulster | 1,308 |
| Ulysses | 596 |
| Union | 3,117 |
| Union City | 2,849 |
| Union Dale | 220 |
| Union Deposit | 451 |
| Uniontown | 9,417 |
| Unionville | 259 |
| Unity | 21,116 |
| University Pittsburgh Bradford | 901 |
| University Pittsburgh Johnstown | 1,464 |
| Upland | 3,009 |
| Upper Allen | 23,977 |
| Upper Augusta | 2,410 |
| Upper Bern | 1,623 |
| Upper Burrell | 2,104 |
| Upper Chichester | 16,620 |
| Upper Darby | 83,949 |
| Upper Dublin | 27,364 |
| Upper Exeter | 857 |
| Upper Fairfield | 1,786 |
| Upper Frankford | 2,240 |
| Upper Frederick | 3,677 |
| Upper Gwynedd | 17,153 |
| Upper Hanover | 8,564 |
| Upper Leacock | 8,940 |
| Upper Macungie | 29,999 |
| Upper Mahanoy | 633 |
| Upper Mahantongo | 617 |
| Upper Makefield | 8,740 |
| Upper Merion | 35,713 |
| Upper Mifflin | 1,386 |
| Upper Milford | 8,241 |
| Upper Moreland | 25,897 |
| Upper Mount Bethel | 6,289 |
| Upper Nazareth | 8,468 |
| Upper Oxford | 2,572 |
| Upper Paxton | 4,000 |
| Upper Pottsgrove | 6,029 |
| Upper Providence | 10,668 |
| Upper Salford | 3,158 |
| Upper Saucon | 17,786 |
| Upper Southampton | 14,926 |
| Upper St. Clair | 20,406 |
| Upper Tulpehocken | 1,865 |
| Upper Turkeyfoot | 1,032 |
| Upper Tyrone | 1,686 |
| Upper Uwchlan | 13,909 |
| Upper Yoder | 5,010 |
| Ursina | 234 |
| Utica | 179 |
| Uwchlan | 19,538 |