| Montemor-o-Velho to Opwijk | 968.81 mi (1,559.15 km) |
| Montemor-o-Velho to Ostend | 944.88 mi (1,520.63 km) |
| Montemor-o-Velho to Oud-Heverlee | 977.35 mi (1,572.89 km) |
| Montemor-o-Velho to Oud-Turnhout | 1,010.45 mi (1,626.17 km) |
| Montemor-o-Velho to Oudenaarde | 945.36 mi (1,521.40 km) |
| Montemor-o-Velho to Oudenburg | 944.93 mi (1,520.71 km) |
| Montemor-o-Velho to Oupeye | 1,003.03 mi (1,614.22 km) |
| Montemor-o-Velho to Overijse | 970.75 mi (1,562.28 km) |
| Montemor-o-Velho to Overpelt | 1,019.23 mi (1,640.29 km) |
| Montemor-o-Velho to Paal | 1,003.13 mi (1,614.38 km) |
| Montemor-o-Velho to Peer | 1,016.46 mi (1,635.83 km) |
| Montemor-o-Velho to Pepinster | 1,002.44 mi (1,613.26 km) |
| Montemor-o-Velho to Peruwelz | 928.25 mi (1,493.87 km) |
| Montemor-o-Velho to Perwez | 972.16 mi (1,564.54 km) |
| Montemor-o-Velho to Philippeville | 943.76 mi (1,518.83 km) |
