Post Offices List in Carroll County, Illinois:
| Chadwick Post Office | 218 N Main St, Chadwick, IL 61014 |
| Lanark Post Office | 600 W Olympic Dr, Lanark, IL 61046 |
| Milledgeville Post Office | 315 N Meyers Ave, Milledgeville, IL 61051 |
| Mount Carroll Post Office | 211 N Clay St, Mount Carroll, IL 61053 |
| Savanna Post Office | 321 3rd St, Savanna, IL 61074 |
| Shannon Post Office | 2 N Locust St, Shannon, IL 61078 |
| Thomson Post Office | 705 Argo Fay Rte, Thomson, IL 61285 |