Post Offices List in Harrison County, Ohio:
| Cadiz Post Office | 82422 Cadiz Jewett Rd, Cadiz, OH 43907 |
| Freeport Post Office | 101 S Philadelphia St, Freeport, OH 43973 |
| Harrisville Post Office | 49364 Main St, Harrisville, OH 43974 |
| Hopedale Post Office | 165 Miller Station Rd, Hopedale, OH 43976 |
| Jewett Post Office | 102 W Main St, Jewett, OH 43986 |
| New Athens Post Office | 128 S Main St, New Athens, OH 43981 |
| Scio Post Office | 114 E Main St, Scio, OH 43988 |