| Olbia to Oberkirch | 530.80 mi (854.25 km) |
| Olbia to Obernburg am Main | 616.78 mi (992.62 km) |
| Olbia to Obernkirchen | 784.40 mi (1,262.36 km) |
| Olbia to Oberschleissheim | 516.73 mi (831.60 km) |
| Olbia to Oberstdorf | 450.28 mi (724.65 km) |
| Olbia to Obertraubling | 571.13 mi (919.14 km) |
| Olbia to Obertshausen | 633.02 mi (1,018.75 km) |
| Olbia to Oberursel | 643.18 mi (1,035.10 km) |
| Olbia to Ochsenfurt | 604.04 mi (972.10 km) |
| Olbia to Ochsenhausen | 494.89 mi (796.44 km) |
| Olbia to Ochtrup | 787.56 mi (1,267.45 km) |
| Olbia to Odenthal | 708.19 mi (1,139.73 km) |
| Olbia to Oelde | 756.97 mi (1,218.22 km) |
| Olbia to Oelsnitz | 668.78 mi (1,076.29 km) |
| Olbia to Oer-Erkenschwick | 748.71 mi (1,204.93 km) |
