| Castelletto sopra Ticino to Octeville | 548.49 mi (882.71 km) |
| Castelletto sopra Ticino to Oignies | 418.75 mi (673.91 km) |
| Castelletto sopra Ticino to Oissel | 431.57 mi (694.54 km) |
| Castelletto sopra Ticino to Olivet | 351.19 mi (565.19 km) |
| Castelletto sopra Ticino to Ollioules | 224.94 mi (362.01 km) |
| Castelletto sopra Ticino to Olonne-sur-Mer | 501.15 mi (806.52 km) |
| Castelletto sopra Ticino to Oloron-Sainte-Marie | 487.53 mi (784.61 km) |
| Castelletto sopra Ticino to Onet Village | 309.20 mi (497.61 km) |
| Castelletto sopra Ticino to Onnaing | 397.60 mi (639.87 km) |
| Castelletto sopra Ticino to Orange | 216.48 mi (348.39 km) |
| Castelletto sopra Ticino to Orchies | 411.98 mi (663.02 km) |
| Castelletto sopra Ticino to Orleans | 351.86 mi (566.27 km) |
| Castelletto sopra Ticino to Orly | 359.64 mi (578.78 km) |
| Castelletto sopra Ticino to Ormesson-sur-Marne | 355.74 mi (572.50 km) |
| Castelletto sopra Ticino to Orsay | 365.83 mi (588.74 km) |
