| Idar-Oberstein to Novi di Modena | 372.82 mi (600.00 km) |
| Idar-Oberstein to Novi Ligure | 349.05 mi (561.74 km) |
| Idar-Oberstein to Nuoro | 656.50 mi (1,056.54 km) |
| Idar-Oberstein to Occhiobello | 386.49 mi (622.00 km) |
| Idar-Oberstein to Oderzo | 362.68 mi (583.68 km) |
| Idar-Oberstein to Oggiono | 287.40 mi (462.53 km) |
| Idar-Oberstein to Olbia | 616.80 mi (992.65 km) |
| Idar-Oberstein to Oleggio | 290.63 mi (467.72 km) |
| Idar-Oberstein to Olgiate Comasco | 282.05 mi (453.91 km) |
| Idar-Oberstein to Olgiate Olona | 291.07 mi (468.43 km) |
| Idar-Oberstein to Omegna | 269.67 mi (433.99 km) |
| Idar-Oberstein to Opera | 311.91 mi (501.98 km) |
| Idar-Oberstein to Oppeano | 354.19 mi (570.01 km) |
| Idar-Oberstein to Orbassano | 325.19 mi (523.34 km) |
| Idar-Oberstein to Orbetello | 535.89 mi (862.43 km) |
