| Portici to Octeville | 984.17 mi (1,583.86 km) |
| Portici to Oignies | 861.11 mi (1,385.82 km) |
| Portici to Oissel | 872.09 mi (1,403.49 km) |
| Portici to Olivet | 782.45 mi (1,259.22 km) |
| Portici to Ollioules | 464.53 mi (747.59 km) |
| Portici to Olonne-sur-Mer | 894.61 mi (1,439.73 km) |
| Portici to Oloron-Sainte-Marie | 783.63 mi (1,261.13 km) |
| Portici to Onet Village | 645.06 mi (1,038.12 km) |
| Portici to Onnaing | 838.88 mi (1,350.05 km) |
| Portici to Orange | 536.66 mi (863.67 km) |
| Portici to Orchies | 853.83 mi (1,374.11 km) |
| Portici to Orleans | 783.61 mi (1,261.10 km) |
| Portici to Orly | 800.21 mi (1,287.82 km) |
| Portici to Ormesson-sur-Marne | 796.88 mi (1,282.46 km) |
| Portici to Orsay | 805.59 mi (1,296.47 km) |
