| Castelfidardo to Oria | 293.21 mi (471.87 km) |
| Castelfidardo to Oristano | 354.56 mi (570.62 km) |
| Castelfidardo to Orta Nova | 184.20 mi (296.44 km) |
| Castelfidardo to Orte | 90.83 mi (146.18 km) |
| Castelfidardo to Ortona | 88.28 mi (142.08 km) |
| Castelfidardo to Orvieto | 88.90 mi (143.08 km) |
| Castelfidardo to Orzinuovi | 222.81 mi (358.58 km) |
| Castelfidardo to Osimo | 3.41 mi (5.49 km) |
| Castelfidardo to Ospitaletto | 223.91 mi (360.36 km) |
| Castelfidardo to Ostuni | 280.01 mi (450.63 km) |
| Castelfidardo to Ottaviano | 186.81 mi (300.65 km) |
| Castelfidardo to Ovada | 256.45 mi (412.71 km) |
| Castelfidardo to Ozieri | 306.42 mi (493.13 km) |
| Castelfidardo to Paceco | 382.26 mi (615.19 km) |
| Castelfidardo to Pachino | 473.36 mi (761.80 km) |
