| Irving to Opwijk | 4,932.59 mi (7,938.24 km) |
| Irving to Ostend | 4,875.97 mi (7,847.11 km) |
| Irving to Oud-Heverlee | 4,955.45 mi (7,975.03 km) |
| Irving to Oud-Turnhout | 4,950.66 mi (7,967.32 km) |
| Irving to Oudenaarde | 4,914.41 mi (7,908.98 km) |
| Irving to Oudenburg | 4,880.44 mi (7,854.31 km) |
| Irving to Oupeye | 4,996.65 mi (8,041.33 km) |
| Irving to Overijse | 4,952.13 mi (7,969.68 km) |
| Irving to Overpelt | 4,970.33 mi (7,998.98 km) |
| Irving to Paal | 4,967.39 mi (7,994.23 km) |
| Irving to Peer | 4,974.64 mi (8,005.91 km) |
| Irving to Pepinster | 5,008.18 mi (8,059.89 km) |
| Irving to Peruwelz | 4,925.03 mi (7,926.08 km) |
| Irving to Perwez | 4,968.30 mi (7,995.71 km) |
| Irving to Philippeville | 4,972.89 mi (8,003.09 km) |
