| Place | Post Code |
|---|---|
| Barabba, Mallala | 5460 |
| Calomba, Mallala | 5501 |
| Dublin, Mallala | 5501 |
| Fischer, Mallala | 5502 |
| Grace Plains, Mallala | 5502 |
| Korunye, Mallala | 5502 |
| Lewiston, Mallala | 5501 |
| Long Plains, Mallala | 5501 |
| Lower Light, Mallala | 5501 |
| Mallala, Mallala | 5502 |
| Middle Beach, Mallala | 5501 |
| Parham, Mallala | 5501 |
| Port Gawler, Mallala | 5501 |
| Redbanks, Mallala | 5502 |
| Reeves Plains, Mallala | 5502 |
| Thompson Beach, Mallala | 5501 |
| Two Wells, Mallala | 5501 |
| Webb Beach, Mallala | 5501 |
| Wild Horse Plains, Mallala | 5501 |
| Windsor, Mallala | 5501 |