| Zip Code | City | Population ↓ |
|---|---|---|
| 17701 | Williamsport | 43,309 |
| 17756 | Muncy | 12,415 |
| 17754 | Montoursville | 12,236 |
| 17740 | Jersey Shore | 11,925 |
| 17702 | Williamsport | 10,653 |
| 17737 | Hughesville | 6,566 |
| 17810 | Allenwood | 5,763 |
| 17752 | Montgomery | 4,929 |
| 17728 | Cogan Station | 4,618 |
| 17771 | Trout Run | 2,978 |
| 17744 | Linden | 2,860 |
| 17774 | Unityville | 1,051 |
| 17762 | Picture Rocks | 455 |
| 17763 | Ralston | 260 |
| 17720 | Antes Fort | 245 |
| 17776 | Waterville | 185 |
| 17723 | Cammal | 65 |
| 17742 | Lairdsville | 56 |
| 17769 | Slate Run | 42 |
| 17739 | Jersey Mills | 25 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 20 ZCTAs in Lycoming County, Pennsylvania (US Census).