| Castelletto sopra Ticino to Oria | 579.05 mi (931.89 km) |
| Castelletto sopra Ticino to Oristano | 401.50 mi (646.15 km) |
| Castelletto sopra Ticino to Orta Nova | 466.12 mi (750.15 km) |
| Castelletto sopra Ticino to Orte | 292.01 mi (469.94 km) |
| Castelletto sopra Ticino to Ortona | 368.84 mi (593.59 km) |
| Castelletto sopra Ticino to Orvieto | 269.32 mi (433.43 km) |
| Castelletto sopra Ticino to Orzinuovi | 66.59 mi (107.16 km) |
| Castelletto sopra Ticino to Osimo | 284.07 mi (457.17 km) |
| Castelletto sopra Ticino to Ospitaletto | 70.45 mi (113.39 km) |
| Castelletto sopra Ticino to Ostuni | 566.51 mi (911.71 km) |
| Castelletto sopra Ticino to Ottaviano | 446.37 mi (718.37 km) |
| Castelletto sopra Ticino to Ovada | 74.45 mi (119.82 km) |
| Castelletto sopra Ticino to Ozieri | 355.06 mi (571.42 km) |
| Castelletto sopra Ticino to Paceco | 570.90 mi (918.77 km) |
| Castelletto sopra Ticino to Pachino | 706.28 mi (1,136.64 km) |
