| Code | Name | Region |
|---|---|---|
| AUOSB | Osborne Island | WA |
| AUOSP | Osborne Park | WA |
| AUOTT | Ottaway | SA |
| AUOTO | Ottoway | SA |
| AUUSS | Ouse | TAS |
| AUOUH | Outer Harbor | |
| AUOHB | Outer Harbour | SA |
| AUOYN | Ouyen | VIC |
| AULEY | Oxley | QLD |
| AUVEY | Oxley | VIC |
| AUNYN | Nyngan | NSW |
| AUOKF | Oak Flats | NSW |
| AUSAO | Oakbank | SA |
| AUOKY | Oakey | QLD |
| AUOAK | Oakford | WA |
| AUOKU | Oakhurst | QLD |
| AUO8O | Oaklands Park | SA |
| AUOLH | Oakleigh | VIC |
| AUS4W | Oakleigh East | VIC |
| AUOBA | Oban | QLD |
| AUOBO | Oberon | NSW |
| AUOGV | Ocean Grove | VIC |
| AUOSF | O'connell | NSW |
| AUOCN | O'connor | WA |
| AUOPI | Oenpelli | NT |
| AUS4E | Officer | VIC |
| AUOKH | Okha Fpso | WA |
| AUOLP | Olympic Dam | SA |
| AUOPH | Onkaparinga Hills | SA |
| AUONS | Onslow | WA |
| AUNTE | Northern Endeavour | NT |
| AUNGT | Northgate | QLD |
| AUNOM | Northmead | NSW |
| AUR5W | Northwood | NSW |
| AUMMT | Norton Summit | SA |
| AUNOR | Norwood | SA |
| AUNTH | Notting Hill | VIC |
| AUNOA | Nowra | NSW |
| AUNUK | Nulkaba | NSW |
| AUNLL | Nullagine | WA |
| AUNUR | Nullarbor | SA |
| AUNUB | Numbulwar | NT |
| AUNUM | Numurkah | VIC |
| AUNWD | Nunawading | VIC |
| AUNDH | Nundah | QLD |
| AUNRP | Nurioopta | SA |
| AUNOO | Nuriootpa | SA |
| AUS3N | Nutfield | VIC |
| AUUTD | Nutwood Downs | NT |
| AUNYA | Nyah | VIC |