Post Offices List in Allen County, Ohio:
| Bluffton Post Office | 132 S Main St, Bluffton, OH 45817 |
| Cairo Post Office | 104 W Main St, Cairo, OH 45820 |
| Delphos Post Office | 127 N Main St, Delphos, OH 45833 |
| Harrod Post Office | 129 W 3rd St, Harrod, OH 45850 |
| Spencerville Post Office | 121 S Broadway St, Spencerville, OH 45887 |
| Cridersville Post Office | 111 E Main St, Lima, OH 45806 |
| Elida Post Office | 304 E Main St, Lima, OH 45807 |
| Lima Post Office | 350 W High St, Lima, OH 45801 |