| Alenquer to Opwijk | 1,042.48 mi (1,677.72 km) |
| Alenquer to Ostend | 1,020.00 mi (1,641.53 km) |
| Alenquer to Oud-Heverlee | 1,050.38 mi (1,690.42 km) |
| Alenquer to Oud-Turnhout | 1,083.89 mi (1,744.36 km) |
| Alenquer to Oudenaarde | 1,019.40 mi (1,640.57 km) |
| Alenquer to Oudenburg | 1,019.93 mi (1,641.42 km) |
| Alenquer to Oupeye | 1,074.94 mi (1,729.96 km) |
| Alenquer to Overijse | 1,043.83 mi (1,679.89 km) |
| Alenquer to Overpelt | 1,092.15 mi (1,757.64 km) |
| Alenquer to Paal | 1,076.00 mi (1,731.66 km) |
| Alenquer to Peer | 1,089.22 mi (1,752.93 km) |
| Alenquer to Pepinster | 1,073.95 mi (1,728.35 km) |
| Alenquer to Peruwelz | 1,001.85 mi (1,612.32 km) |
| Alenquer to Perwez | 1,044.72 mi (1,681.32 km) |
| Alenquer to Philippeville | 1,015.89 mi (1,634.92 km) |
