| Castel Volturno to Octeville | 957.14 mi (1,540.38 km) |
| Castel Volturno to Oignies | 835.32 mi (1,344.31 km) |
| Castel Volturno to Oissel | 845.34 mi (1,360.44 km) |
| Castel Volturno to Olivet | 755.37 mi (1,215.65 km) |
| Castel Volturno to Ollioules | 437.98 mi (704.86 km) |
| Castel Volturno to Olonne-sur-Mer | 867.41 mi (1,395.96 km) |
| Castel Volturno to Oloron-Sainte-Marie | 757.86 mi (1,219.66 km) |
| Castel Volturno to Onet Village | 618.19 mi (994.87 km) |
| Castel Volturno to Onnaing | 813.27 mi (1,308.82 km) |
| Castel Volturno to Orange | 509.62 mi (820.16 km) |
| Castel Volturno to Orchies | 828.13 mi (1,332.75 km) |
| Castel Volturno to Orleans | 756.55 mi (1,217.54 km) |
| Castel Volturno to Orly | 773.49 mi (1,244.81 km) |
| Castel Volturno to Ormesson-sur-Marne | 770.20 mi (1,239.52 km) |
| Castel Volturno to Orsay | 778.81 mi (1,253.37 km) |
