| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Onex | city | Geneve | Switzerland | 46.18 | 6.10 | 1669 | 279423 |
| Onnens | city | Vaud | Switzerland | 46.84 | 6.69 | 1669 | 5000 |
| Onnens | city | Freiburg | Switzerland | 46.78 | 7.04 | 2509 | 11880 |
| Onnens (VD) | city | Vaud | Switzerland | 46.84 | 6.69 | 1669 | 5000 |
| Onsingen | city | Solothurn | Switzerland | 47.29 | 7.72 | 1669 | 19456 |