City | 2024 Population |
|---|---|
| Jackson | 6,289 |
| Jackson Center | 185 |
| Jacksonville | 36 |
| Jacksonwald | 4,373 |
| Jacobus | 1,820 |
| James City | 166 |
| Jamestown | 566 |
| Jamison City | 395 |
| Jay | 1,878 |
| Jeannette | 8,533 |
| Jeddo | 108 |
| Jefferson | 237 |
| Jefferson Hills | 12,095 |
| Jenkins | 4,507 |
| Jenkintown | 4,693 |
| Jenks | 3,201 |
| Jenner | 3,580 |
| Jennerstown | 662 |
| Jermyn | 2,128 |
| Jerome | 705 |
| Jersey Shore | 4,063 |
| Jerseytown | 180 |
| Jessup | 4,480 |
| Jim Thorpe | 4,537 |
| Joffre | 401 |
| Johnsonburg | 2,305 |
| Johnstown | 17,809 |
| Jones | 1,528 |
| Jonestown | 68 |
| Jordan | 465 |
| Jugtown | 17 |
| Julian | 312 |
| Juniata | 910 |
| Juniata Gap | 482 |
| Juniata Terrace | 549 |