| City | 2026 Pop. ↓ |
|---|---|
| Orange | 42,022 |
| Oran Park | 26,070 |
| Oakleigh Huntingdale | 25,618 |
| Orange North | 24,849 |
| Ocean Grove | 23,907 |
| Oyster Bay Como Jannali | 22,932 |
| Ocean Grove | 21,247 |
| Oxenford Maudsland | 20,460 |
| Oatlands Dundas Valley | 19,712 |
| Orange | 18,921 |
| Ormond Glen Huntly | 15,055 |
| Old Bar Manning Point Red Head | 13,648 |
| Ormeau Yatala | 13,474 |
| Oatley Hurstville Grove | 12,951 |
| Ormeau Stapylton | 12,723 |
| Orange Surrounds | 12,183 |