7 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 61074 | Savanna | 4,009 |
| 61053 | Mount Carroll | 2,902 |
| 61285 | Thomson | 2,687 |
| 61046 | Lanark | 2,599 |
| 61051 | Milledgeville | 1,521 |
| 61078 | Shannon | 1,411 |
| 61014 | Chadwick | 1,124 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 7 ZCTAs in Carroll County, Illinois (US Census).