| Place | Post Code |
|---|---|
| Altmünster, Altmünster | 4801, 4810, 4813, 4814 |
| Eben, Altmünster | 4801, 4813, 4814 |
| Ebenzweier, Altmünster | 4813 |
| Eck, Altmünster | 4810, 4813 |
| Gmundnerberg, Altmünster | 4812, 4813, 4814 |
| Grasberg, Altmünster | 4813, 4814 |
| Mühlbach, Altmünster | 4801 |
| Nachdemsee, Altmünster | 4801, 4813 |
| Neukirchen, Altmünster | 4812, 4813, 4814 |
| Reindlmühl, Altmünster | 4814 |