Post Offices List in Marion County, Ohio:
| Caledonia Post Office | 128 S Main St, Caledonia, OH 43314 |
| Green Camp Post Office | 216 Marion St, Green Camp, OH 43322 |
| La Rue Post Office | 65 S High St, La Rue, OH 43332 |
| Marion Post Office | 230 Barks Rd W, Marion, OH 43302 |
| Morral Post Office | 150 W Neff St, Morral, OH 43337 |
| New Bloomington Post Office | 160 S Main St, New Bloomington, OH 43341 |
| Prospect Post Office | 120 N Main St, Prospect, OH 43342 |
| Waldo Post Office | 117 S Marion St, Waldo, OH 43356 |