| Locality | Post Code |
|---|---|
| Alder, Madison | 59710 |
| Cameron, Madison | 59720 |
| Ennis, Madison | 59729 |
| Harrison, Madison | 59735 |
| McAllister, Madison | 59740 |
| Norris, Madison | 59745 |
| Pony, Madison | 59747 |
| Sheridan, Madison | 59749 |
| Silver Star, Madison | 59751 |
| Twin Bridges, Madison | 59754 |
| Virginia City, Madison | 59755 |