| Mortara to Oerlinghausen | 464.09 mi (746.89 km) |
| Mortara to Oestrich-Winkel | 330.04 mi (531.15 km) |
| Mortara to Offenburg | 225.57 mi (363.03 km) |
| Mortara to Oftersheim | 284.81 mi (458.36 km) |
| Mortara to Ohrdruf | 396.11 mi (637.47 km) |
| Mortara to Ohringen | 275.17 mi (442.85 km) |
| Mortara to Olbernhau | 429.97 mi (691.96 km) |
| Mortara to Olching | 237.29 mi (381.89 km) |
| Mortara to Oldenburg | 545.95 mi (878.62 km) |
| Mortara to Oldenburg in Holstein | 632.42 mi (1,017.78 km) |
| Mortara to Olfen | 451.15 mi (726.05 km) |
| Mortara to Olpe | 400.67 mi (644.81 km) |
| Mortara to Olsberg | 421.65 mi (678.57 km) |
| Mortara to Oranienburg | 556.69 mi (895.90 km) |
| Mortara to Ortenberg | 353.06 mi (568.20 km) |
