22 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 18042 | Easton | 45,532 |
| 18017 | Bethlehem | 40,640 |
| 18015 | Bethlehem | 34,852 |
| 18045 | Easton | 30,429 |
| 18064 | Nazareth | 26,970 |
| 18020 | Bethlehem | 21,204 |
| 18067 | Northampton | 19,590 |
| 18013 | Bangor | 17,597 |
| 18040 | Easton | 17,256 |
| 18055 | Hellertown | 12,117 |
| 18014 | Bath | 12,097 |
| 18088 | Walnutport | 8,488 |
| 18072 | Pen Argyl | 6,938 |
| 18091 | Wind Gap | 6,547 |
| 18343 | Mount Bethel | 3,637 |
| 18038 | Danielsville | 3,549 |
| 18085 | Tatamy | 1,175 |
| 18063 | Martins Creek | 606 |
| 18351 | Portland | 546 |
| 18083 | Stockertown | 489 |
| 18086 | Treichlers | 229 |
| 18035 | Cherryville | 39 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 22 ZCTAs in Northampton County, Pennsylvania (US Census).