Post Offices List in Lyon County, Kansas:
| Admire Post Office | 107 W 5th St, Admire, KS 66830 |
| Allen Post Office | 402 Main St, Allen, KS 66833 |
| Americus Post Office | 611 Main St, Americus, KS 66835 |
| Emporia Post Office | 625 Merchant St, Emporia, KS 66801 |
| Hartford Post Office | 212 Commercial St, Hartford, KS 66854 |
| Neosho Rapids Post Office | 516 Main St, Neosho Rapids, KS 66864 |
| Olpe Post Office | 118 Westphalia St, Olpe, KS 66865 |
| Reading Post Office | 413 1st St, Reading, KS 66868 |