| Idar-Oberstein to Obernburg am Main | 82.06 mi (132.06 km) |
| Idar-Oberstein to Obernkirchen | 193.18 mi (310.89 km) |
| Idar-Oberstein to Oberschleissheim | 217.67 mi (350.31 km) |
| Idar-Oberstein to Oberstdorf | 208.98 mi (336.32 km) |
| Idar-Oberstein to Obertraubling | 224.47 mi (361.24 km) |
| Idar-Oberstein to Obertshausen | 71.98 mi (115.85 km) |
| Idar-Oberstein to Oberursel | 65.66 mi (105.67 km) |
| Idar-Oberstein to Ochsenfurt | 123.17 mi (198.22 km) |
| Idar-Oberstein to Ochsenhausen | 164.77 mi (265.17 km) |
| Idar-Oberstein to Ochtrup | 172.42 mi (277.48 km) |
| Idar-Oberstein to Odenthal | 91.74 mi (147.65 km) |
| Idar-Oberstein to Oelde | 151.10 mi (243.17 km) |
| Idar-Oberstein to Oelsnitz | 220.68 mi (355.14 km) |
| Idar-Oberstein to Oer-Erkenschwick | 133.43 mi (214.74 km) |
| Idar-Oberstein to Oerlinghausen | 166.64 mi (268.17 km) |
