| Castelli Calepio to Opwijk | 452.29 mi (727.89 km) |
| Castelli Calepio to Ostend | 501.27 mi (806.71 km) |
| Castelli Calepio to Oud-Heverlee | 432.30 mi (695.72 km) |
| Castelli Calepio to Oud-Turnhout | 452.44 mi (728.13 km) |
| Castelli Calepio to Oudenaarde | 462.20 mi (743.85 km) |
| Castelli Calepio to Oudenburg | 496.75 mi (799.44 km) |
| Castelli Calepio to Oupeye | 401.62 mi (646.35 km) |
| Castelli Calepio to Overijse | 432.97 mi (696.79 km) |
| Castelli Calepio to Overpelt | 436.93 mi (703.17 km) |
| Castelli Calepio to Paal | 431.82 mi (694.95 km) |
| Castelli Calepio to Peer | 431.10 mi (693.79 km) |
| Castelli Calepio to Pepinster | 389.33 mi (626.56 km) |
| Castelli Calepio to Peruwelz | 445.64 mi (717.18 km) |
| Castelli Calepio to Perwez | 416.79 mi (670.76 km) |
| Castelli Calepio to Philippeville | 400.95 mi (645.26 km) |
