| Location | States or Territories | Abbreviation | Postcode |
|---|---|---|---|
| Old Cooranga | Queensland | QLD | 4626 |
| Oman Ama | Queensland | QLD | 4352 |
| One Mile, Ipswich | Queensland | QLD | 4305 |
| Oombabeer | Queensland | QLD | 4718 |
| Oonoonba | Queensland | QLD | 4811 |
| Ooralea | Queensland | QLD | 4740 |
| Oorindi | Queensland | QLD | 4824 |
| Opalton | Queensland | QLD | 4735 |
| Orallo | Queensland | QLD | 4455 |
| Orange Creek | Queensland | QLD | 4715 |
| Orange Hill | Queensland | QLD | 4455 |
| Orion | Queensland | QLD | 4722 |
| Orkabie | Queensland | QLD | 4741 |
| Ormeau | Queensland | QLD | 4208 |
| Ormeau Hills | Queensland | QLD | 4208 |
| Ormiston | Queensland | QLD | 4160 |
| Osborne | Queensland | QLD | 4806 |
| Ottaba | Queensland | QLD | 4313 |
| Owanyilla | Queensland | QLD | 4650 |
| Owens Creek | Queensland | QLD | 4741 |
