| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Onder-Papegaaiberg | city | | South Africa | -33.9333333 | 18.8333333 | 416 | 30523 |
| Onder-Smoordrif | city | | South Africa | -32.8833333 | 25.8166667 | 1870 | 642 |
| Ondersmoorddrift | city | | South Africa | -32.8833333 | 25.8166667 | 1870 | 642 |
| Onderste Doornknie | city | | South Africa | -29.4166667 | 20.3666667 | 2982 | 42 |
| Onderstepoort | city | | South Africa | -25.6505556 | 28.1841667 | 3927 | 32687 |
| Ongedad | city | | South Africa | -27.1833333 | 22.25 | 3320 | 420 |
| Ongegund | city | Free State | South Africa | -30.2 | 26.85 | 5124 | 492 |
| Ongelegen | city | | South Africa | -33.7333333 | 23.4 | 2450 | 498 |
| Ongeluksfontein | city | Free State | South Africa | -30.55 | 26.3166667 | 4366 | 473 |
| Ongelukskop | city | Free State | South Africa | -29.7666667 | 26.1333333 | 4524 | 417 |
| Ongoye | city | Province of KwaZulu-Natal | South Africa | -28.8833333 | 31.7333333 | 200 | 25708 |
| Onrus | city | | South Africa | -34.4 | 19.1833333 | 446 | 3213 |
| Onrust | city | | South Africa | -34.4 | 19.1833333 | 446 | 3213 |
| Onrustrivier | city | | South Africa | -34.4 | 19.1833333 | 446 | 3213 |
| Ons Hoop | city | | South Africa | -23.5666667 | 27.7166667 | 2647 | 411 |
| Ons Rust | city | | South Africa | -33.3 | 19.05 | 492 | 3725 |
| Onse Rust | city | Free State | South Africa | -29.2833333 | 26.2 | 4524 | 6356 |
| Onseepkans | city | | South Africa | -28.75 | 19.2833333 | 1112 | 42 |
| Onseepkans | city | | South Africa | -28.7333333 | 19.3 | 1053 | 42 |
| Onverdiend | city | Free State | South Africa | -27.8 | 28.2166667 | 5478 | 1395 |
| Onvergenoeg | city | Province of KwaZulu-Natal | South Africa | -28.3166667 | 30.8 | 3943 | 12272 |
| Onverwacht | city | | South Africa | -33.85 | 24.4333333 | 1256 | 1372 |
| Onverwacht | city | | South Africa | -23.6833333 | 27.6833333 | 2801 | 411 |
| Onverwacht 2 | city | | South Africa | -31.3666667 | 26.3166667 | 5223 | 901 |
| Onverwag | city | | South Africa | -31 | 25.7666667 | 4803 | 376 |
| Onverwag | city | | South Africa | -24.8333333 | 31 | 3149 | 24645 |
| Onverwags | city | | South Africa | -30.8166667 | 21.5166667 | 4448 | 73 |
| Onverwags | city | | South Africa | -26.8833333 | 29.1333333 | 5229 | 2147 |
| Onverwagslaagte | city | | South Africa | -33.85 | 24.4333333 | 1256 | 1372 |
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