Post Offices List in Allen County, Kansas:
| Gas Post Office | 102 W 1st St, Gas, KS 66742 |
| Humboldt Post Office | 811 New York St, Humboldt, KS 66748 |
| Iola Post Office | 120 West St, Iola, KS 66749 |
| La Harpe Post Office | 802 S Main St, La Harpe, KS 66751 |
| Moran Post Office | 226 N Cedar St, Moran, KS 66755 |