| Place | Post Code |
|---|---|
| Allanson, Collie | 6225 |
| Buckingham, Collie | 6225 |
| Cardiff, Collie | 6225 |
| Collie, Collie | 6225 |
| Collie Burn, Collie | 6225 |
| Harris River, Collie | 6225 |
| Lyalls Mill, Collie | 6225 |
| Muja, Collie | 6225 |
| Mungalup, Collie | 6225 |
| Palmer, Collie | 6225 |
| Preston Settlement, Collie | 6225 |
| Shotts, Collie | 6225 |
| Worsley, Collie | 6225 |
| Yourdamung Lake, Collie | 6225 |