Post Offices List in Clay County, Illinois:
| Clay City Post Office | 332 S Main St, Clay City, IL 62824 |
| Flora Post Office | 312 E North Ave, Flora, IL 62839 |
| Ingraham Post Office | 5253 Old Ingraham Rd, Ingraham, IL 62434 |
| Louisville Post Office | 150 E Chestnut St, Louisville, IL 62858 |
| Xenia Post Office | 102 N Main St, Xenia, IL 62899 |