| South Houston to Opwijk | 5,033.29 mi (8,100.29 km) |
| South Houston to Ostend | 4,976.11 mi (8,008.28 km) |
| South Houston to Oud-Heverlee | 5,056.25 mi (8,137.25 km) |
| South Houston to Oud-Turnhout | 5,053.57 mi (8,132.94 km) |
| South Houston to Oudenaarde | 5,013.99 mi (8,069.24 km) |
| South Houston to Oudenburg | 4,980.52 mi (8,015.38 km) |
| South Houston to Oupeye | 5,098.20 mi (8,204.76 km) |
| South Houston to Overijse | 5,052.59 mi (8,131.35 km) |
| South Houston to Overpelt | 5,073.41 mi (8,164.86 km) |
| South Houston to Paal | 5,069.54 mi (8,158.63 km) |
| South Houston to Peer | 5,077.47 mi (8,171.39 km) |
| South Houston to Pepinster | 5,109.46 mi (8,222.87 km) |
| South Houston to Peruwelz | 5,023.39 mi (8,084.36 km) |
| South Houston to Perwez | 5,068.54 mi (8,157.02 km) |
| South Houston to Philippeville | 5,071.28 mi (8,161.44 km) |
