| Callaway to Opwijk | 4,621.88 mi (7,438.20 km) |
| Callaway to Ostend | 4,564.21 mi (7,345.39 km) |
| Callaway to Oud-Heverlee | 4,644.83 mi (7,475.14 km) |
| Callaway to Oud-Turnhout | 4,646.14 mi (7,477.23 km) |
| Callaway to Oudenaarde | 4,600.68 mi (7,404.09 km) |
| Callaway to Oudenburg | 4,568.46 mi (7,352.23 km) |
| Callaway to Oupeye | 4,687.80 mi (7,544.29 km) |
| Callaway to Overijse | 4,640.56 mi (7,468.27 km) |
| Callaway to Overpelt | 4,666.11 mi (7,509.37 km) |
| Callaway to Paal | 4,660.52 mi (7,500.38 km) |
| Callaway to Peer | 4,669.65 mi (7,515.07 km) |
| Callaway to Pepinster | 4,698.42 mi (7,561.38 km) |
| Callaway to Peruwelz | 4,607.73 mi (7,415.42 km) |
| Callaway to Perwez | 4,655.95 mi (7,493.02 km) |
| Callaway to Philippeville | 4,655.26 mi (7,491.92 km) |
