| Tortona to Oerlinghausen | 488.75 mi (786.56 km) |
| Tortona to Oestrich-Winkel | 355.08 mi (571.45 km) |
| Tortona to Offenburg | 250.76 mi (403.55 km) |
| Tortona to Oftersheim | 309.57 mi (498.21 km) |
| Tortona to Ohrdruf | 418.99 mi (674.30 km) |
| Tortona to Ohringen | 298.99 mi (481.18 km) |
| Tortona to Olbernhau | 449.36 mi (723.17 km) |
| Tortona to Olching | 256.36 mi (412.57 km) |
| Tortona to Oldenburg | 570.76 mi (918.54 km) |
| Tortona to Oldenburg in Holstein | 656.06 mi (1,055.82 km) |
| Tortona to Olfen | 476.26 mi (766.46 km) |
| Tortona to Olpe | 425.70 mi (685.10 km) |
| Tortona to Olsberg | 446.40 mi (718.41 km) |
| Tortona to Oranienburg | 578.07 mi (930.32 km) |
| Tortona to Ortenberg | 377.46 mi (607.47 km) |
