| Location | States or Territories | Abbreviation | Postcode |
|---|---|---|---|
| Oakdowns | Tasmania | TAS | 7019 |
| Oaks | Tasmania | TAS | 7303 |
| Oatlands | Tasmania | TAS | 7120 |
| Ocean Vista | Tasmania | TAS | 7320 |
| Old Beach | Tasmania | TAS | 7017 |
| Oldina | Tasmania | TAS | 7325 |
| Oonah | Tasmania | TAS | 7325 |
| Opossum Bay | Tasmania | TAS | 7023 |
| Orford | Tasmania | TAS | 7190 |
| Orielton | Tasmania | TAS | 7172 |
| Osmaston | Tasmania | TAS | 7303 |
| Osterley | Tasmania | TAS | 7140 |
| Otago | Tasmania | TAS | 7017 |
| Ouse | Tasmania | TAS | 7140 |
| Oyster Cove | Tasmania | TAS | 7150 |
