| Castle Rock to Noventa Vicentina | 5,384.50 mi (8,665.51 km) |
| Castle Rock to Novi di Modena | 5,381.57 mi (8,660.79 km) |
| Castle Rock to Novi Ligure | 5,313.41 mi (8,551.10 km) |
| Castle Rock to Nuoro | 5,546.18 mi (8,925.72 km) |
| Castle Rock to Occhiobello | 5,403.81 mi (8,696.59 km) |
| Castle Rock to Oderzo | 5,392.86 mi (8,678.97 km) |
| Castle Rock to Oggiono | 5,284.68 mi (8,504.87 km) |
| Castle Rock to Olbia | 5,523.47 mi (8,889.16 km) |
| Castle Rock to Oleggio | 5,268.20 mi (8,478.36 km) |
| Castle Rock to Olgiate Comasco | 5,271.26 mi (8,483.28 km) |
| Castle Rock to Olgiate Olona | 5,275.44 mi (8,490.00 km) |
| Castle Rock to Omegna | 5,247.11 mi (8,444.41 km) |
| Castle Rock to Opera | 5,299.03 mi (8,527.97 km) |
| Castle Rock to Oppeano | 5,371.62 mi (8,644.78 km) |
| Castle Rock to Orbassano | 5,256.99 mi (8,460.31 km) |
