8 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 61462 | Monmouth | 10,458 |
| 61473 | Roseville | 1,279 |
| 61447 | Kirkwood | 1,020 |
| 61453 | Little York | 677 |
| 61423 | Cameron | 638 |
| 61478 | Smithshire | 420 |
| 61435 | Gerlaw | 271 |
| 61417 | Berwick | 182 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 8 ZCTAs in Warren County, Illinois (US Census).