20 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 17701 | Williamsport | 43,104 |
| 17756 | Muncy | 12,856 |
| 17754 | Montoursville | 12,061 |
| 17740 | Jersey Shore | 12,017 |
| 17702 | Williamsport | 10,488 |
| 17737 | Hughesville | 5,970 |
| 17810 | Allenwood | 5,309 |
| 17752 | Montgomery | 4,975 |
| 17728 | Cogan Station | 4,675 |
| 17771 | Trout Run | 2,929 |
| 17744 | Linden | 2,808 |
| 17774 | Unityville | 962 |
| 17762 | Picture Rocks | 557 |
| 17720 | Antes Fort | 250 |
| 17763 | Ralston | 241 |
| 17776 | Waterville | 145 |
| 17723 | Cammal | 34 |
| 17769 | Slate Run | 31 |
| 17739 | Jersey Mills | 27 |
| 17742 | Lairdsville | 21 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 20 ZCTAs in Lycoming County, Pennsylvania (US Census).