Post Offices List in Highland County, Ohio:
| Greenfield Post Office | 233 Jefferson St, Greenfield, OH 45123 |
| Highland Post Office | 7914 W Main St, Highland, OH 45132 |
| Hillsboro Post Office | 301 N High St Side, Hillsboro, OH 45133 |
| Leesburg Post Office | 44 E Main St, Leesburg, OH 45135 |
| Mowrystown Post Office | 2 W Main St, Mowrystown, OH 45155 |
| Sinking Spring Post Office | 103 S Main St, Sinking Spring, OH 45172 |