| Osterburg to Opwijk | 346.77 mi (558.07 km) |
| Osterburg to Ostend | 391.10 mi (629.42 km) |
| Osterburg to Oud-Heverlee | 331.70 mi (533.82 km) |
| Osterburg to Oud-Turnhout | 305.38 mi (491.46 km) |
| Osterburg to Oudenaarde | 373.26 mi (600.70 km) |
| Osterburg to Oudenburg | 388.81 mi (625.73 km) |
| Osterburg to Oupeye | 298.49 mi (480.37 km) |
| Osterburg to Overijse | 338.46 mi (544.70 km) |
| Osterburg to Overpelt | 290.87 mi (468.11 km) |
| Osterburg to Paal | 305.65 mi (491.89 km) |
| Osterburg to Peer | 291.86 mi (469.70 km) |
| Osterburg to Pepinster | 297.26 mi (478.40 km) |
| Osterburg to Peruwelz | 383.90 mi (617.83 km) |
| Osterburg to Perwez | 332.77 mi (535.54 km) |
| Osterburg to Philippeville | 357.87 mi (575.94 km) |
