Post Offices List in Coles County, Illinois:
| Ashmore Post Office | 103 W Ashmore St, Ashmore, IL 61912 |
| Charleston Post Office | 667 Windsor Rd, Charleston, IL 61920 |
| Humboldt Post Office | 407 Elm St, Humboldt, IL 61931 |
| Lerna Post Office | 513 Main St, Lerna, IL 62440 |
| Mattoon Post Office | 120 N 15th St, Mattoon, IL 61938 |
| Oakland Post Office | 4 Pike St, Oakland, IL 61943 |