| Crystal to Opwijk | 4,185.67 mi (6,736.19 km) |
| Crystal to Ostend | 4,130.80 mi (6,647.87 km) |
| Crystal to Oud-Heverlee | 4,208.08 mi (6,772.24 km) |
| Crystal to Oud-Turnhout | 4,199.09 mi (6,757.78 km) |
| Crystal to Oudenaarde | 4,169.97 mi (6,710.92 km) |
| Crystal to Oudenburg | 4,135.34 mi (6,655.19 km) |
| Crystal to Oupeye | 4,247.31 mi (6,835.39 km) |
| Crystal to Overijse | 4,205.48 mi (6,768.06 km) |
| Crystal to Overpelt | 4,218.22 mi (6,788.57 km) |
| Crystal to Paal | 4,217.16 mi (6,786.86 km) |
| Crystal to Peer | 4,222.99 mi (6,796.24 km) |
| Crystal to Pepinster | 4,259.30 mi (6,854.69 km) |
| Crystal to Peruwelz | 4,183.00 mi (6,731.89 km) |
| Crystal to Perwez | 4,221.94 mi (6,794.55 km) |
| Crystal to Philippeville | 4,230.25 mi (6,807.93 km) |
