| Locality | Post Code |
|---|---|
| Alamo, Williams | 58830 |
| Alkabo, Williams | 58845 |
| Appam, Williams | 58830 |
| Bonetraill, Williams | 58801 |
| Buford, Williams | 58801 |
| Corinth, Williams | 58830 |
| Epping, Williams | 58843 |
| Grenora, Williams | 58845 |
| Hamlet, Williams | 58795 |
| Hanks, Williams | 58856 |
| Marmon, Williams | 58856 |
| McGregor, Williams | 58755 |
| Ray, Williams | 58849 |
| Round Prairie, Williams | 58801 |
| Spring Brook, Williams | 58843 |
| Temple, Williams | 58852 |
| Tioga, Williams | 58852 |
| Trenton, Williams | 58853 |
| Westby, Williams | 58845 |
| Wheelock, Williams | 58849 |
| Wildrose, Williams | 58795 |
| Williston, Williams | 58801 |
| Zahl, Williams | 58856 |