16 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 7840 | Hackettstown | 32,952 |
| 8865 | Phillipsburg | 30,561 |
| 7882 | Washington | 14,670 |
| 7825 | Blairstown | 9,723 |
| 7823 | Belvidere | 7,644 |
| 8886 | Stewartsville | 6,963 |
| 7863 | Oxford | 3,582 |
| 7838 | Great Meadows | 3,190 |
| 7832 | Columbia | 3,175 |
| 7865 | Port Murray | 2,533 |
| 7880 | Vienna | 357 |
| 7833 | Delaware | 112 |
| 7844 | Hope | 104 |
| 7831 | Changewater | 30 |
| 7846 | Johnsonburg | 22 |
| 7820 | Allamuchy | 1 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 16 ZCTAs in Warren County, New Jersey (US Census).