| Oristano to Oerlinghausen | 833.34 mi (1,341.12 km) |
| Oristano to Oestrich-Winkel | 698.04 mi (1,123.38 km) |
| Oristano to Offenburg | 592.39 mi (953.36 km) |
| Oristano to Oftersheim | 653.95 mi (1,052.44 km) |
| Oristano to Ohrdruf | 761.69 mi (1,225.83 km) |
| Oristano to Ohringen | 643.71 mi (1,035.95 km) |
| Oristano to Olbernhau | 778.00 mi (1,252.07 km) |
| Oristano to Olching | 588.73 mi (947.47 km) |
| Oristano to Oldenburg | 914.84 mi (1,472.29 km) |
| Oristano to Oldenburg in Holstein | 1,000.23 mi (1,609.71 km) |
| Oristano to Olfen | 818.10 mi (1,316.60 km) |
| Oristano to Olpe | 768.56 mi (1,236.87 km) |
| Oristano to Olsberg | 790.73 mi (1,272.56 km) |
| Oristano to Oranienburg | 914.51 mi (1,471.75 km) |
| Oristano to Ortenberg | 722.37 mi (1,162.55 km) |
