Post Offices List in Clay County, Iowa:
| Dickens Post Office | 201 2nd St, Dickens, IA 51333 |
| Everly Post Office | 206 N Main St, Everly, IA 51338 |
| Fostoria Post Office | 206 Main St, Fostoria, IA 51340 |
| Gillett Grove Post Office | 211 Railway St, Gillett Grove, IA 51341 |
| Peterson Post Office | 222 Main St, Peterson, IA 51047 |
| Royal Post Office | 308 Main St, Royal, IA 51357 |
| Spencer Post Office | 11 E 18th St, Spencer, IA 51301 |
| Webb Post Office | 104 2nd Ave, Webb, IA 51366 |