| Place | Post Code |
|---|---|
| Altona, Hobsons Bay | 3018 |
| Altona East, Hobsons Bay | 3025 |
| Altona Gate, Hobsons Bay | 3025 |
| Altona Meadows, Hobsons Bay | 3028 |
| Altona North, Hobsons Bay | 3025 |
| Laverton, Hobsons Bay | 3028 |
| Newport, Hobsons Bay | 3015 |
| Seabrook, Hobsons Bay | 3028 |
| Seaholme, Hobsons Bay | 3018 |
| South Kingsville, Hobsons Bay | 3015 |
| Spotswood, Hobsons Bay | 3015 |
| Williamstown, Hobsons Bay | 3016 |
| Williamstown North, Hobsons Bay | 3016 |