| Trecastagni to Octeville | 1,173.28 mi (1,888.21 km) |
| Trecastagni to Oignies | 1,068.97 mi (1,720.34 km) |
| Trecastagni to Oissel | 1,068.12 mi (1,718.97 km) |
| Trecastagni to Olivet | 971.40 mi (1,563.31 km) |
| Trecastagni to Ollioules | 617.38 mi (993.57 km) |
| Trecastagni to Olonne-sur-Mer | 1,058.04 mi (1,702.75 km) |
| Trecastagni to Oloron-Sainte-Marie | 909.09 mi (1,463.04 km) |
| Trecastagni to Onet Village | 799.62 mi (1,286.86 km) |
| Trecastagni to Onnaing | 1,048.23 mi (1,686.96 km) |
| Trecastagni to Orange | 699.83 mi (1,126.27 km) |
| Trecastagni to Orchies | 1,062.46 mi (1,709.87 km) |
| Trecastagni to Orleans | 972.89 mi (1,565.72 km) |
| Trecastagni to Orly | 997.21 mi (1,604.85 km) |
| Trecastagni to Ormesson-sur-Marne | 994.68 mi (1,600.78 km) |
| Trecastagni to Orsay | 1,001.52 mi (1,611.80 km) |
