| Castelfidardo to Opwijk | 678.46 mi (1,091.88 km) |
| Castelfidardo to Ostend | 730.07 mi (1,174.93 km) |
| Castelfidardo to Oud-Heverlee | 657.32 mi (1,057.85 km) |
| Castelfidardo to Oud-Turnhout | 673.42 mi (1,083.76 km) |
| Castelfidardo to Oudenaarde | 690.74 mi (1,111.65 km) |
| Castelfidardo to Oudenburg | 725.51 mi (1,167.60 km) |
| Castelfidardo to Oupeye | 622.75 mi (1,002.21 km) |
| Castelfidardo to Overijse | 658.77 mi (1,060.18 km) |
| Castelfidardo to Overpelt | 656.24 mi (1,056.12 km) |
| Castelfidardo to Paal | 653.44 mi (1,051.60 km) |
| Castelfidardo to Peer | 650.71 mi (1,047.22 km) |
| Castelfidardo to Pepinster | 610.36 mi (982.28 km) |
| Castelfidardo to Peruwelz | 675.56 mi (1,087.21 km) |
| Castelfidardo to Perwez | 642.31 mi (1,033.70 km) |
| Castelfidardo to Philippeville | 629.53 mi (1,013.13 km) |
