| Castel San Giorgio to Novi di Modena | 342.97 mi (551.96 km) |
| Castel San Giorgio to Novi Ligure | 406.55 mi (654.28 km) |
| Castel San Giorgio to Nuoro | 283.54 mi (456.32 km) |
| Castel San Giorgio to Occhiobello | 326.60 mi (525.62 km) |
| Castel San Giorgio to Oderzo | 362.66 mi (583.65 km) |
| Castel San Giorgio to Oggiono | 437.68 mi (704.38 km) |
| Castel San Giorgio to Olbia | 271.89 mi (437.56 km) |
| Castel San Giorgio to Oleggio | 451.56 mi (726.72 km) |
| Castel San Giorgio to Olgiate Comasco | 449.76 mi (723.81 km) |
| Castel San Giorgio to Olgiate Olona | 444.84 mi (715.90 km) |
| Castel San Giorgio to Omegna | 472.93 mi (761.11 km) |
| Castel San Giorgio to Opera | 421.19 mi (677.85 km) |
| Castel San Giorgio to Oppeano | 358.97 mi (577.71 km) |
| Castel San Giorgio to Orbassano | 465.13 mi (748.56 km) |
| Castel San Giorgio to Orbetello | 213.40 mi (343.43 km) |
