| Locality | Post Code |
|---|---|
| Ansonia, Darke | 45303 |
| Arcanum, Darke | 45304 |
| Bradford, Darke | 45308 |
| Castine, Darke | 45304 |
| Gettysburg, Darke | 45328 |
| Gordon, Darke | 45304 |
| Greenville, Darke | 45331 |
| Hollansburg, Darke | 45332 |
| Ithaca, Darke | 45304 |
| New Madison, Darke | 45346 |
| New Weston, Darke | 45348 |
| North Star, Darke | 45350 |
| Osgood, Darke | 45351 |
| Palestine, Darke | 45352 |
| Pitsburg, Darke | 45358 |
| Rossburg, Darke | 45362 |
| Union City, Darke | 45390 |
| Versailles, Darke | 45380 |
| Yorkshire, Darke | 45388 |