| Castiglion Fiorentino to Octeville | 775.82 mi (1,248.56 km) |
| Castiglion Fiorentino to Oignies | 647.04 mi (1,041.32 km) |
| Castiglion Fiorentino to Oissel | 661.06 mi (1,063.88 km) |
| Castiglion Fiorentino to Olivet | 575.54 mi (926.24 km) |
| Castiglion Fiorentino to Ollioules | 305.88 mi (492.26 km) |
| Castiglion Fiorentino to Olonne-sur-Mer | 703.93 mi (1,132.87 km) |
| Castiglion Fiorentino to Oloron-Sainte-Marie | 629.65 mi (1,013.33 km) |
| Castiglion Fiorentino to Onet Village | 469.68 mi (755.88 km) |
| Castiglion Fiorentino to Onnaing | 624.79 mi (1,005.50 km) |
| Castiglion Fiorentino to Orange | 358.98 mi (577.72 km) |
| Castiglion Fiorentino to Orchies | 639.74 mi (1,029.57 km) |
| Castiglion Fiorentino to Orleans | 576.50 mi (927.79 km) |
| Castiglion Fiorentino to Orly | 589.08 mi (948.04 km) |
| Castiglion Fiorentino to Ormesson-sur-Marne | 585.43 mi (942.16 km) |
| Castiglion Fiorentino to Orsay | 594.90 mi (957.39 km) |
