| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Oeltrotten | city | Nidwalden | Switzerland | 46.95 | 8.40 | 2509 | 23624 |
| Oensingen | city | Solothurn | Switzerland | 47.29 | 7.72 | 1669 | 19456 |
| Oenz | city | Bern | Switzerland | 47.18 | 7.69 | 1669 | 18929 |
| Oerlikon | city | Zurich | Switzerland | 47.41 | 8.56 | 1669 | 227478 |
| Oeschberg | city | Bern | Switzerland | 47.13 | 7.61 | 1669 | 23249 |
| Oetwil | city | Zurich | Switzerland | 47.43 | 8.40 | 1669 | 77622 |
| Oetwil / Oetwil an der Limmat | city | Zurich | Switzerland | 47.43 | 8.40 | 1669 | 77622 |
| Oetwil am See | city | Zurich | Switzerland | 47.27 | 8.72 | 1748 | 52046 |
| Oetwil an der Limmat | city | Zurich | Switzerland | 47.43 | 8.40 | 1669 | 77622 |
| Oey | city | Bern | Switzerland | 46.66 | 7.58 | 2690 | 4195 |