16 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 07840 | Hackettstown | 32,105 |
| 08865 | Phillipsburg | 31,427 |
| 07882 | Washington | 15,115 |
| 07825 | Blairstown | 9,210 |
| 07823 | Belvidere | 7,451 |
| 08886 | Stewartsville | 6,435 |
| 07863 | Oxford | 3,819 |
| 07838 | Great Meadows | 3,727 |
| 07832 | Columbia | 3,593 |
| 07865 | Port Murray | 2,825 |
| 07880 | Vienna | 173 |
| 07844 | Hope | 111 |
| 07833 | Delaware | 70 |
| 07846 | Johnsonburg | 45 |
| 07831 | Changewater | 36 |
| 07820 | Allamuchy | 0 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 16 ZCTAs in Warren County, New Jersey (US Census).