| Locality | Post Code |
|---|---|
| Berne, Monona | 51060 |
| Blencoe, Monona | 51523 |
| Castana, Monona | 51010 |
| Hornick, Monona | 51026 |
| Little Sioux, Monona | 51545 |
| Mapleton, Monona | 51034 |
| Moorhead, Monona | 51558 |
| Onawa, Monona | 51040 |
| Rodney, Monona | 51051 |
| Sloan, Monona | 51055 |
| Soldier, Monona | 51572 |
| Ticonic, Monona | 51010 |
| Turin, Monona | 51040 |
| Ute, Monona | 51060 |
| Whiting, Monona | 51063 |