| Upper Montclair to Opwijk | 3,651.41 mi (5,876.38 km) |
| Upper Montclair to Ostend | 3,593.81 mi (5,783.67 km) |
| Upper Montclair to Oud-Heverlee | 3,674.39 mi (5,913.37 km) |
| Upper Montclair to Oud-Turnhout | 3,674.67 mi (5,913.82 km) |
| Upper Montclair to Oudenaarde | 3,630.72 mi (5,843.07 km) |
| Upper Montclair to Oudenburg | 3,598.11 mi (5,790.59 km) |
| Upper Montclair to Oupeye | 3,717.14 mi (5,982.16 km) |
| Upper Montclair to Overijse | 3,670.28 mi (5,906.75 km) |
| Upper Montclair to Overpelt | 3,694.64 mi (5,945.94 km) |
| Upper Montclair to Paal | 3,689.47 mi (5,937.63 km) |
| Upper Montclair to Peer | 3,698.31 mi (5,951.85 km) |
| Upper Montclair to Pepinster | 3,727.94 mi (5,999.54 km) |
| Upper Montclair to Peruwelz | 3,638.46 mi (5,855.54 km) |
| Upper Montclair to Perwez | 3,685.84 mi (5,931.79 km) |
| Upper Montclair to Philippeville | 3,686.16 mi (5,932.31 km) |
