| Locality | Post Code |
|---|---|
| Allbright, Madison | 63655 |
| Big Creek, Madison | 63655 |
| Buckhorn, Madison | 63655 |
| Cobalt, Madison | 63645 |
| Des Arc, Madison | 63636 |
| Fredericktown, Madison | 63645 |
| Gravelton, Madison | 63655 |
| Marquand, Madison | 63655 |
| Millcreek, Madison | 63645 |
| Mine La Motte, Madison | 63645 |
| Womack, Madison | 63645 |