| Horta to Opwijk | 1,804.24 mi (2,903.65 km) |
| Horta to Ostend | 1,756.79 mi (2,827.27 km) |
| Horta to Oud-Heverlee | 1,822.15 mi (2,932.47 km) |
| Horta to Oud-Turnhout | 1,844.12 mi (2,967.82 km) |
| Horta to Oudenaarde | 1,777.59 mi (2,860.76 km) |
| Horta to Oudenburg | 1,759.23 mi (2,831.21 km) |
| Horta to Oupeye | 1,861.41 mi (2,995.66 km) |
| Horta to Overijse | 1,815.64 mi (2,921.99 km) |
| Horta to Overpelt | 1,860.42 mi (2,994.06 km) |
| Horta to Paal | 1,847.08 mi (2,972.59 km) |
| Horta to Peer | 1,860.50 mi (2,994.19 km) |
| Horta to Pepinster | 1,866.57 mi (3,003.96 km) |
| Horta to Peruwelz | 1,770.66 mi (2,849.60 km) |
| Horta to Perwez | 1,824.81 mi (2,936.75 km) |
| Horta to Philippeville | 1,806.42 mi (2,907.15 km) |
