| Castel Mella to Oria | 511.78 mi (823.63 km) |
| Castel Mella to Oristano | 394.52 mi (634.91 km) |
| Castel Mella to Orta Nova | 400.91 mi (645.21 km) |
| Castel Mella to Orte | 237.61 mi (382.39 km) |
| Castel Mella to Ortona | 303.39 mi (488.27 km) |
| Castel Mella to Orvieto | 215.38 mi (346.63 km) |
| Castel Mella to Orzinuovi | 12.57 mi (20.23 km) |
| Castel Mella to Osimo | 215.39 mi (346.64 km) |
| Castel Mella to Ospitaletto | 5.33 mi (8.57 km) |
| Castel Mella to Ostuni | 498.63 mi (802.47 km) |
| Castel Mella to Ottaviano | 388.15 mi (624.68 km) |
| Castel Mella to Ovada | 94.45 mi (152.00 km) |
| Castel Mella to Ozieri | 344.49 mi (554.40 km) |
| Castel Mella to Paceco | 533.82 mi (859.10 km) |
| Castel Mella to Pachino | 658.98 mi (1,060.52 km) |
