| Castellammare del Golfo to Octeville | 1,076.31 mi (1,732.15 km) |
| Castellammare del Golfo to Oignies | 987.24 mi (1,588.81 km) |
| Castellammare del Golfo to Oissel | 976.43 mi (1,571.42 km) |
| Castellammare del Golfo to Olivet | 875.91 mi (1,409.65 km) |
| Castellammare del Golfo to Ollioules | 510.55 mi (821.66 km) |
| Castellammare del Golfo to Olonne-sur-Mer | 949.64 mi (1,528.30 km) |
| Castellammare del Golfo to Oloron-Sainte-Marie | 791.14 mi (1,273.21 km) |
| Castellammare del Golfo to Onet Village | 690.35 mi (1,111.00 km) |
| Castellammare del Golfo to Onnaing | 968.22 mi (1,558.20 km) |
| Castellammare del Golfo to Orange | 595.26 mi (957.98 km) |
| Castellammare del Golfo to Orchies | 981.58 mi (1,579.70 km) |
| Castellammare del Golfo to Orleans | 877.60 mi (1,412.35 km) |
| Castellammare del Golfo to Orly | 906.83 mi (1,459.41 km) |
| Castellammare del Golfo to Ormesson-sur-Marne | 904.93 mi (1,456.34 km) |
| Castellammare del Golfo to Orsay | 910.35 mi (1,465.06 km) |
