| Idar-Oberstein to Opwijk | 162.99 mi (262.30 km) |
| Idar-Oberstein to Ostend | 219.69 mi (353.55 km) |
| Idar-Oberstein to Oud-Heverlee | 140.22 mi (225.67 km) |
| Idar-Oberstein to Oud-Turnhout | 150.92 mi (242.88 km) |
| Idar-Oberstein to Oudenaarde | 181.81 mi (292.60 km) |
| Idar-Oberstein to Oudenburg | 215.25 mi (346.41 km) |
| Idar-Oberstein to Oupeye | 100.98 mi (162.51 km) |
| Idar-Oberstein to Overijse | 143.41 mi (230.79 km) |
| Idar-Oberstein to Overpelt | 133.31 mi (214.54 km) |
| Idar-Oberstein to Paal | 131.56 mi (211.73 km) |
| Idar-Oberstein to Peer | 127.84 mi (205.74 km) |
| Idar-Oberstein to Pepinster | 88.79 mi (142.89 km) |
| Idar-Oberstein to Peruwelz | 174.35 mi (280.59 km) |
| Idar-Oberstein to Perwez | 127.27 mi (204.82 km) |
| Idar-Oberstein to Philippeville | 127.37 mi (204.99 km) |
