20 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 17701 | Williamsport | 43,169 |
| 17756 | Muncy | 12,525 |
| 17754 | Montoursville | 11,971 |
| 17740 | Jersey Shore | 11,600 |
| 17702 | Williamsport | 10,506 |
| 17737 | Hughesville | 6,476 |
| 17810 | Allenwood | 5,769 |
| 17752 | Montgomery | 4,867 |
| 17728 | Cogan Station | 4,749 |
| 17771 | Trout Run | 2,955 |
| 17744 | Linden | 2,789 |
| 17774 | Unityville | 1,093 |
| 17762 | Picture Rocks | 560 |
| 17720 | Antes Fort | 271 |
| 17763 | Ralston | 264 |
| 17776 | Waterville | 158 |
| 17723 | Cammal | 53 |
| 17742 | Lairdsville | 48 |
| 17769 | Slate Run | 43 |
| 17739 | Jersey Mills | 24 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 20 ZCTAs in Lycoming County, Pennsylvania (US Census).