Post Offices List in Clay County, Kansas:
| Clay Center Post Office | 806 6th St, Clay Center, KS 67432 |
| Green Post Office | 110 Dixon Ave, Green, KS 67447 |
| Longford Post Office | 115 Weda St, Longford, KS 67458 |
| Morganville Post Office | 201 Main St, Morganville, KS 67468 |
| Wakefield Post Office | 713 Elm St, Wakefield, KS 67487 |