Post Offices List in Calhoun County, Illinois:
| Batchtown Post Office | 301 Batchtown Rd, Batchtown, IL 62006 |
| Brussels Post Office | 167 E Main St, Brussels, IL 62013 |
| Hamburg Post Office | 408 State St, Hamburg, IL 62045 |
| Hardin Post Office | 103 E Main St, Hardin, IL 62047 |
| Kampsville Post Office | 100 N Broadway, Kampsville, IL 62053 |