| Place | State | Latitude | Longitude | Elevation (meters) | Elevation (feet) |
|---|
| Olifantsfontein | Gauteng | -25.9638889 | 28.2394444 | 1540 | 5052 |
| Olifantshoek | Limpopo Province | -23.3333333 | 30.2833333 | 597 | 1959 |
| Olifantshoek | Province of Northern Cape | -27.9333333 | 22.7333333 | 1317 | 4321 |
| Oliviershoek | Province of KwaZulu-Natal | -28.7 | 29.1666667 | 1180 | 3871 |
| Oliviersrust | Province of Eastern Cape | -30.7666667 | 28.4166667 | 1431 | 4695 |
| Olkersia | Province of the Western Cape | -33.2166667 | 19.5333333 | 1059 | 3474 |
| Olverton | Province of North-West | -25.0669444 | 28.1897222 | 1065 | 3494 |
| Olyfberg | Limpopo Province | -23.7666667 | 29.95 | 1322 | 4337 |
| Onder-Papegaaiberg | Province of the Western Cape | -33.9333333 | 18.8333333 | 139 | 456 |
| Onder-Smoordrif | Province of Eastern Cape | -32.8833333 | 25.8166667 | 548 | 1798 |
| Ongelegen | Province of Eastern Cape | -33.7333333 | 23.4 | 777 | 2549 |
| Ongoye | Province of KwaZulu-Natal | -28.8833333 | 31.7333333 | 107 | 351 |
| Onrus | Province of the Western Cape | -34.4 | 19.1833333 | 292 | 958 |
| Ons Hoop | Limpopo Province | -23.5666667 | 27.7166667 | 816 | 2677 |
| Ons Rust | Province of the Western Cape | -33.3 | 19.05 | 88 | 289 |
| Onseepkans | Province of Northern Cape | -28.7333333 | 19.3 | 364 | 1194 |
| Onseepkans | Province of Northern Cape | -28.75 | 19.2833333 | 390 | 1280 |
| Onvergenoeg | Province of KwaZulu-Natal | -28.3166667 | 30.8 | 1197 | 3927 |
| Onverwacht | Limpopo Province | -23.6833333 | 27.6833333 | 858 | 2815 |
| Onverwag | Mpumalanga | -24.8333333 | 31 | 921 | 3022 |
