| Mariano Comense to Oria | 556.96 mi (896.35 km) |
| Mariano Comense to Oristano | 401.46 mi (646.09 km) |
| Mariano Comense to Orta Nova | 444.83 mi (715.89 km) |
| Mariano Comense to Orte | 274.49 mi (441.76 km) |
| Mariano Comense to Ortona | 347.34 mi (559.00 km) |
| Mariano Comense to Orvieto | 251.87 mi (405.34 km) |
| Mariano Comense to Orzinuovi | 41.79 mi (67.26 km) |
| Mariano Comense to Osimo | 261.13 mi (420.25 km) |
| Mariano Comense to Ospitaletto | 44.15 mi (71.05 km) |
| Mariano Comense to Ostuni | 544.15 mi (875.73 km) |
| Mariano Comense to Ottaviano | 427.84 mi (688.54 km) |
| Mariano Comense to Ovada | 77.82 mi (125.24 km) |
| Mariano Comense to Ozieri | 353.54 mi (568.96 km) |
| Mariano Comense to Paceco | 560.49 mi (902.02 km) |
| Mariano Comense to Pachino | 692.22 mi (1,114.01 km) |
