| Castel Mella to Octeville | 618.41 mi (995.23 km) |
| Castel Mella to Oignies | 476.46 mi (766.79 km) |
| Castel Mella to Oissel | 499.29 mi (803.53 km) |
| Castel Mella to Olivet | 423.50 mi (681.55 km) |
| Castel Mella to Ollioules | 267.98 mi (431.28 km) |
| Castel Mella to Olonne-sur-Mer | 575.96 mi (926.92 km) |
| Castel Mella to Oloron-Sainte-Marie | 554.35 mi (892.14 km) |
| Castel Mella to Onet Village | 377.68 mi (607.81 km) |
| Castel Mella to Onnaing | 453.53 mi (729.88 km) |
| Castel Mella to Orange | 278.06 mi (447.49 km) |
| Castel Mella to Orchies | 468.78 mi (754.43 km) |
| Castel Mella to Orleans | 424.03 mi (682.41 km) |
| Castel Mella to Orly | 427.75 mi (688.40 km) |
| Castel Mella to Ormesson-sur-Marne | 423.37 mi (681.35 km) |
| Castel Mella to Orsay | 434.51 mi (699.28 km) |
