| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| O'Connor | city | State of Western Australia | Australia | -31.95 | 116.1833333 | 715 | 8439 |
| Oak Park | city | State of Western Australia | Australia | -31.1666667 | 116.9 | 994 | 69 |
| Oakabella | city | State of Western Australia | Australia | -28.5 | 114.6166667 | 344 | 30 |
| Ogilvie | city | State of Western Australia | Australia | -28.15 | 114.6333333 | 544 | 33 |
| Old Napier Downs | city | State of Western Australia | Australia | -17.25 | 124.7333333 | 508 | 5 |
| Ongerup | city | State of Western Australia | Australia | -33.9666667 | 118.4833333 | 948 | 47 |
| Onslow | city | State of Western Australia | Australia | -21.65 | 115.1 | 3 | 5 |
| Ora Banda | city | State of Western Australia | Australia | -30.3666667 | 121.0666667 | 1591 | 42 |
| OʼConnor | city | State of Western Australia | Australia | -31.95 | 116.1833333 | 715 | 8439 |