| Campobasso to Octeville | 962.02 mi (1,548.22 km) |
| Campobasso to Oignies | 829.95 mi (1,335.67 km) |
| Campobasso to Oissel | 847.20 mi (1,363.44 km) |
| Campobasso to Olivet | 761.46 mi (1,225.45 km) |
| Campobasso to Ollioules | 463.02 mi (745.16 km) |
| Campobasso to Olonne-sur-Mer | 883.47 mi (1,421.82 km) |
| Campobasso to Oloron-Sainte-Marie | 786.46 mi (1,265.69 km) |
| Campobasso to Onet Village | 639.60 mi (1,029.34 km) |
| Campobasso to Onnaing | 806.92 mi (1,298.61 km) |
| Campobasso to Orange | 529.55 mi (852.22 km) |
| Campobasso to Orchies | 822.24 mi (1,323.27 km) |
| Campobasso to Orleans | 762.46 mi (1,227.07 km) |
| Campobasso to Orly | 775.23 mi (1,247.61 km) |
| Campobasso to Ormesson-sur-Marne | 771.51 mi (1,241.62 km) |
| Campobasso to Orsay | 781.11 mi (1,257.07 km) |
