16 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 07840 | Hackettstown | 31,995 |
| 08865 | Phillipsburg | 31,078 |
| 07882 | Washington | 14,918 |
| 07825 | Blairstown | 9,271 |
| 07823 | Belvidere | 7,542 |
| 08886 | Stewartsville | 6,493 |
| 07863 | Oxford | 4,097 |
| 07838 | Great Meadows | 3,495 |
| 07832 | Columbia | 3,459 |
| 07865 | Port Murray | 3,284 |
| 07880 | Vienna | 195 |
| 07844 | Hope | 111 |
| 07833 | Delaware | 72 |
| 07831 | Changewater | 39 |
| 07846 | Johnsonburg | 29 |
| 07820 | Allamuchy | 0 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 16 ZCTAs in Warren County, New Jersey (US Census).