| Locality | Post Code |
|---|---|
| Beaver Dam, Ohio | 42320 |
| Centertown, Ohio | 42328 |
| Cool Springs, Ohio | 42320 |
| Cromwell, Ohio | 42333 |
| Dundee, Ohio | 42338 |
| Echols, Ohio | 42320 |
| Fordsville, Ohio | 42343 |
| Hartford, Ohio | 42347 |
| Horse Branch, Ohio | 42349 |
| Horton, Ohio | 42320 |
| McHenry, Ohio | 42354 |
| Narrows, Ohio | 42347 |
| Nineteen, Ohio | 42320 |
| Olaton, Ohio | 42361 |
| Prentiss, Ohio | 42320 |
| Render, Ohio | 42320 |
| Reynolds Station, Ohio | 42368 |
| Rockport, Ohio | 42369 |
| Rosine, Ohio | 42370 |
| Schultztown, Ohio | 42320 |
| Taylor Mines, Ohio | 42320 |
| Trisler, Ohio | 42343 |
| Utica, Ohio | 42376 |
| Whitesville, Ohio | 42378 |
| Yeaman, Ohio | 42343 |