| Odorheiu Secuiesc to Opwijk | 1,012.20 mi (1,628.98 km) |
| Odorheiu Secuiesc to Ostend | 1,069.32 mi (1,720.90 km) |
| Odorheiu Secuiesc to Oud-Heverlee | 989.83 mi (1,592.97 km) |
| Odorheiu Secuiesc to Oud-Turnhout | 983.00 mi (1,581.99 km) |
| Odorheiu Secuiesc to Oudenaarde | 1,035.89 mi (1,667.11 km) |
| Odorheiu Secuiesc to Oudenburg | 1,065.38 mi (1,714.57 km) |
| Odorheiu Secuiesc to Oupeye | 946.30 mi (1,522.92 km) |
| Odorheiu Secuiesc to Overijse | 994.95 mi (1,601.22 km) |
| Odorheiu Secuiesc to Overpelt | 963.21 mi (1,550.13 km) |
| Odorheiu Secuiesc to Paal | 970.93 mi (1,562.56 km) |
| Odorheiu Secuiesc to Peer | 960.38 mi (1,545.58 km) |
| Odorheiu Secuiesc to Pepinster | 936.98 mi (1,507.93 km) |
| Odorheiu Secuiesc to Peruwelz | 1,033.20 mi (1,662.78 km) |
| Odorheiu Secuiesc to Perwez | 980.92 mi (1,578.64 km) |
| Odorheiu Secuiesc to Philippeville | 988.01 mi (1,590.04 km) |
