| Idar-Oberstein to Octeville | 400.30 mi (644.22 km) |
| Idar-Oberstein to Oignies | 198.48 mi (319.41 km) |
| Idar-Oberstein to Oissel | 280.12 mi (450.80 km) |
| Idar-Oberstein to Olivet | 277.40 mi (446.43 km) |
| Idar-Oberstein to Ollioules | 459.39 mi (739.32 km) |
| Idar-Oberstein to Olonne-sur-Mer | 472.57 mi (760.53 km) |
| Idar-Oberstein to Oloron-Sainte-Marie | 586.61 mi (944.06 km) |
| Idar-Oberstein to Onet Village | 430.86 mi (693.40 km) |
| Idar-Oberstein to Onnaing | 171.30 mi (275.68 km) |
| Idar-Oberstein to Orange | 402.71 mi (648.11 km) |
| Idar-Oberstein to Orchies | 187.88 mi (302.37 km) |
| Idar-Oberstein to Orleans | 275.76 mi (443.79 km) |
| Idar-Oberstein to Orly | 231.81 mi (373.06 km) |
| Idar-Oberstein to Ormesson-sur-Marne | 224.61 mi (361.47 km) |
| Idar-Oberstein to Orsay | 241.69 mi (388.96 km) |
