| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| O'Halloran Hill | city | State of South Australia | Australia | -35.0666667 | 138.55 | 495 | 90681 |
| Oakbank | city | State of South Australia | Australia | -34.9833333 | 138.85 | 1000 | 4256 |
| Oakdale | city | State of South Australia | Australia | -33.8166667 | 135.5 | 331 | 19 |
| Oaklands | city | State of South Australia | Australia | -35 | 137.6833333 | 59 | 423 |
| Oaklands | city | State of South Australia | Australia | -35.0166667 | 138.5333333 | 252 | 106172 |
| Oladdie | city | State of South Australia | Australia | -32.5333333 | 138.6833333 | 1604 | 14 |
| Olary | city | State of South Australia | Australia | -32.2833333 | 140.3166667 | 974 | 0 |
| Old Berlino | city | State of South Australia | Australia | -27.8 | 138.4 | 206 | 0 |
| Old Berlino Homestead | city | State of South Australia | Australia | -27.8 | 138.4 | 206 | 0 |
| Old Umbum | city | State of South Australia | Australia | -28.4666667 | 136.4 | 324 | 0 |
| Old Umbum Homestead | city | State of South Australia | Australia | -28.4666667 | 136.4 | 324 | 0 |
| Old Umbum Station | city | State of South Australia | Australia | -28.4666667 | 136.4 | 324 | 0 |
| One Tree Hill | city | State of South Australia | Australia | -34.7 | 138.7666667 | 610 | 17081 |
| Oodla Wirra | city | State of South Australia | Australia | -32.8833333 | 139.0666667 | 1322 | 14 |
| Oodnadatta | city | State of South Australia | Australia | -27.55 | 135.4666667 | 456 | 0 |
| Orroroo | city | State of South Australia | Australia | -32.7333333 | 138.6166667 | 1735 | 84 |
| Overland Corner | city | State of South Australia | Australia | -34.1666667 | 140.3333333 | 85 | 481 |
| Owen | city | State of South Australia | Australia | -34.2666667 | 138.55 | 390 | 327 |
| OʼHalloran Hill | city | State of South Australia | Australia | -35.0666667 | 138.55 | 495 | 90681 |
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