| Castleton to Noventa Vicentina | 839.23 mi (1,350.61 km) |
| Castleton to Novi di Modena | 839.48 mi (1,351.00 km) |
| Castleton to Novi Ligure | 783.92 mi (1,261.60 km) |
| Castleton to Nuoro | 1,062.68 mi (1,710.21 km) |
| Castleton to Occhiobello | 859.51 mi (1,383.25 km) |
| Castleton to Oderzo | 846.29 mi (1,361.98 km) |
| Castleton to Oggiono | 744.11 mi (1,197.53 km) |
| Castleton to Olbia | 1,029.79 mi (1,657.28 km) |
| Castleton to Oleggio | 732.61 mi (1,179.01 km) |
| Castleton to Olgiate Comasco | 732.49 mi (1,178.83 km) |
| Castleton to Olgiate Olona | 738.14 mi (1,187.93 km) |
| Castleton to Omegna | 710.71 mi (1,143.78 km) |
| Castleton to Opera | 761.69 mi (1,225.82 km) |
| Castleton to Oppeano | 827.06 mi (1,331.02 km) |
| Castleton to Orbassano | 735.57 mi (1,183.79 km) |
