ZIP CodesZIP codes in Carroll County, Illinois
Carroll County, Illinois has 7 ZIP codes in this list, from 61014 to 61285. They cover 7 places, among them Chadwick, Lanark, Milledgeville and Mount Carroll.
| ZIP code | Place | Land area (sq mi) | Map point |
|---|---|---|---|
| 61014 | Chadwick | 63.5 | 41.996, -89.896 |
| 61046 | Lanark | 84.0 | 42.093, -89.825 |
| 61051 | Milledgeville | 50.7 | 41.967, -89.780 |
| 61053 | Mount Carroll | 108 | 42.105, -89.984 |
| 61074 | Savanna | 73.5 | 42.096, -90.140 |
| 61078 | Shannon | 55.4 | 42.161, -89.748 |
| 61285 | Thomson | 44.4 | 41.982, -90.084 |
The ZIP code areas of Carroll County add up to about 479 square miles of land (1,241 sq km) as the Census Bureau draws them. The largest is 61053 (Mount Carroll), with 108 square miles.
Using these codes
- In an address, the ZIP code comes last, after the city and the two-letter state: Chadwick, IL 61014.
- Tap a ZIP code to open it in the look-up, with a copy button for the address line.
- A code can cross a county line, and one town can have several codes. The table shows the main place of each code.
- "No area" means the Census Bureau draws no area for that code. Such codes are usually for post office boxes or a single building.
Places and counties: GeoNames. Areas: U.S. Census Bureau, 2024 ZIP Code Tabulation Areas. Checked in November 2026. This site is not connected with the United States Postal Service; for mailing, confirm the address with USPS.