| Locality | Post Code |
|---|---|
| Alvordton, Williams | 43501 |
| Archbold, Williams | 43570 |
| Blakeslee, Williams | 43505 |
| Bryan, Williams | 43506 |
| Edgerton, Williams | 43517 |
| Edon, Williams | 43518 |
| Evansport, Williams | 43557 |
| Holiday City, Williams | 43543, 43554 |
| Kunkle, Williams | 43531 |
| Montpelier, Williams | 43543 |
| Pioneer, Williams | 43554 |
| Stryker, Williams | 43557 |
| West Unity, Williams | 43570 |