| Allen to Opwijk | 4,908.25 mi (7,899.07 km) |
| Allen to Ostend | 4,851.63 mi (7,807.94 km) |
| Allen to Oud-Heverlee | 4,931.12 mi (7,935.86 km) |
| Allen to Oud-Turnhout | 4,926.34 mi (7,928.19 km) |
| Allen to Oudenaarde | 4,890.07 mi (7,869.80 km) |
| Allen to Oudenburg | 4,856.10 mi (7,815.13 km) |
| Allen to Oupeye | 4,972.32 mi (8,002.17 km) |
| Allen to Overijse | 4,927.79 mi (7,930.51 km) |
| Allen to Overpelt | 4,946.02 mi (7,959.84 km) |
| Allen to Paal | 4,943.06 mi (7,955.09 km) |
| Allen to Peer | 4,950.32 mi (7,966.78 km) |
| Allen to Pepinster | 4,983.85 mi (8,020.74 km) |
| Allen to Peruwelz | 4,900.68 mi (7,886.88 km) |
| Allen to Perwez | 4,943.96 mi (7,956.53 km) |
| Allen to Philippeville | 4,948.54 mi (7,963.90 km) |
