| Tortona to Oberkirch | 254.15 mi (409.01 km) |
| Tortona to Obernburg am Main | 341.96 mi (550.34 km) |
| Tortona to Obernkirchen | 509.50 mi (819.96 km) |
| Tortona to Oberschleissheim | 264.95 mi (426.40 km) |
| Tortona to Oberstdorf | 186.50 mi (300.14 km) |
| Tortona to Obertraubling | 321.49 mi (517.39 km) |
| Tortona to Obertshausen | 357.39 mi (575.16 km) |
| Tortona to Oberursel | 367.07 mi (590.74 km) |
| Tortona to Ochsenfurt | 333.37 mi (536.51 km) |
| Tortona to Ochsenhausen | 225.53 mi (362.96 km) |
| Tortona to Ochtrup | 510.91 mi (822.23 km) |
| Tortona to Odenthal | 431.78 mi (694.89 km) |
| Tortona to Oelde | 480.56 mi (773.39 km) |
| Tortona to Oelsnitz | 411.23 mi (661.81 km) |
| Tortona to Oer-Erkenschwick | 472.09 mi (759.75 km) |
