UpAlphabetical listing of Places in South Australia
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| O'Halloran Hill | city | South Australia | Australia | -35.07 | 138.55 | 830 | 91216 |
| Oak Park | city | South Australia | Australia | -32.84 | 139.60 | 997 | 0 |
| Oak Vale | city | South Australia | Australia | -32.91 | 134.37 | 144 | 0 |
| Oakbank | city | South Australia | Australia | -34.98 | 138.85 | 1000 | 10211 |
| Oakbank | city | South Australia | Australia | -33.05 | 140.58 | 301 | 0 |
| Oakdale | city | South Australia | Australia | -33.82 | 135.50 | 331 | 0 |
| Oaklands | city | South Australia | Australia | -35.00 | 137.68 | 59 | 447 |
| Oaklands | city | South Australia | Australia | -35.02 | 138.53 | 252 | 109335 |
| Oaklands | city | South Australia | Australia | -35.25 | 138.92 | 226 | 745 |
| Oakvale | city | South Australia | Australia | -32.98 | 140.78 | 351 | 0 |
| Officer Creek | city | South Australia | Australia | -26.51 | 131.90 | 1978 | 0 |
| Okeltabie | city | South Australia | Australia | -33.33 | 135.02 | 334 | 0 |
| Oladdie | city | South Australia | Australia | -32.47 | 138.63 | 1669 | 0 |
| Oladdie | city | South Australia | Australia | -32.53 | 138.68 | 1669 | 0 |
| Olary | city | South Australia | Australia | -32.28 | 140.33 | 967 | 0 |
| Old Berlino | city | South Australia | Australia | -27.80 | 138.40 | 206 | 0 |
| Old Berlino Homestead | city | South Australia | Australia | -27.80 | 138.40 | 206 | 0 |
| Old Caroona | city | South Australia | Australia | -33.43 | 139.12 | 1013 | 1 |
| Old Koomooloo | city | South Australia | Australia | -33.57 | 139.72 | 252 | 0 |
| Old Lake Dismal | city | South Australia | Australia | -32.05 | 140.92 | 830 | 0 |
| Old Manunda | city | South Australia | Australia | -32.91 | 139.78 | 859 | 0 |
| Old Minburra | city | South Australia | Australia | -32.35 | 139.02 | 866 | 0 |
| Old Nillinghoo | city | South Australia | Australia | -32.02 | 139.45 | 830 | 0 |
| Old Noarlunga | city | South Australia | Australia | -35.18 | 138.50 | 206 | 50536 |
| Old Siam | city | South Australia | Australia | -32.41 | 136.67 | 830 | 0 |
| Old Umbum | city | South Australia | Australia | -28.47 | 136.40 | 324 | 0 |
| Old Umbum Homestead | city | South Australia | Australia | -28.47 | 136.40 | 324 | 0 |
| Old Umbum Station | city | South Australia | Australia | -28.47 | 136.40 | 324 | 0 |
| Old Wabricoola | city | South Australia | Australia | -32.47 | 139.35 | 1669 | 0 |
| Old Waukaringa | city | South Australia | Australia | -32.45 | 139.17 | 997 | 0 |
| Old Whydown | city | South Australia | Australia | -32.71 | 139.26 | 1158 | 0 |
| Olympic Dam Village | city | South Australia | Australia | -30.48 | 136.89 | 341 | 902 |
| One Tree Hill | city | South Australia | Australia | -34.70 | 138.77 | 830 | 12847 |
| Oodla Wirra | city | South Australia | Australia | -32.88 | 139.07 | 1669 | 0 |
| Oodnadatta | city | South Australia | Australia | -27.55 | 135.45 | 830 | 0 |
| Ooldea | city | South Australia | Australia | -30.46 | 131.84 | 830 | 0 |
| Oopina | city | South Australia | Australia | -32.23 | 139.43 | 997 | 0 |
| Oopina Station | city | South Australia | Australia | -32.23 | 139.43 | 997 | 0 |
| Opella | city | South Australia | Australia | -35.71 | 139.52 | 226 | 54 |
| Oraparinna | city | South Australia | Australia | -31.37 | 138.72 | 2020 | 0 |
| Oratunga | city | South Australia | Australia | -31.05 | 138.55 | 1669 | 0 |
| Orillia | city | South Australia | Australia | -35.43 | 138.63 | 830 | 1099 |
| Orrie Cowie | city | South Australia | Australia | -34.97 | 137.32 | 65 | 127 |
| Orroroo | city | South Australia | Australia | -32.73 | 138.61 | 1735 | 149 |
| Orwell | city | South Australia | Australia | -30.53 | 135.60 | 830 | 0 |
| Orwelland | city | South Australia | Australia | -35.21 | 140.57 | 830 | 0 |
| Ostrich Farm | city | South Australia | Australia | -35.62 | 139.18 | 121 | 137 |
| Oulnina | city | South Australia | Australia | -32.51 | 140.05 | 1669 | 0 |
| Oulnina Park | city | South Australia | Australia | -32.57 | 139.87 | 1669 | 0 |
| Outalpa | city | South Australia | Australia | -32.35 | 140.17 | 1040 | 0 |
| Outalpa | city | South Australia | Australia | -32.22 | 140.15 | 1082 | 0 |
| Overland Corner | city | South Australia | Australia | -34.15 | 140.33 | 141 | 582 |
| Owen | city | South Australia | Australia | -34.27 | 138.54 | 354 | 298 |
| O’Halloran Hill | city | South Australia | Australia | -35.07 | 138.55 | 830 | 91216 |
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