| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Opacua | city | Euskadi | Spain | 42.83 | -2.36 | 2690 | 3741 |
| Opakua | city | Euskadi | Spain | 42.83 | -2.36 | 2690 | 3741 |
| Opellora | city | Euskadi | Spain | 43.10 | -3.10 | 830 | 1919 |
| Opellora / Costera | city | Euskadi | Spain | 43.10 | -3.10 | 830 | 1919 |
| Opio | city | Castilla y Leon | Spain | 43.14 | -3.23 | 1217 | 3338 |
| Oporto | city | Galicia | Spain | 42.37 | -7.10 | 2509 | 6600 |