| Castro Valley to Noventa Vicentina | 6,017.23 mi (9,683.80 km) |
| Castro Valley to Novi di Modena | 6,021.46 mi (9,690.60 km) |
| Castro Valley to Novi Ligure | 5,967.81 mi (9,604.27 km) |
| Castro Valley to Nuoro | 6,230.83 mi (10,027.55 km) |
| Castro Valley to Occhiobello | 6,039.05 mi (9,718.91 km) |
| Castro Valley to Oderzo | 6,015.40 mi (9,680.85 km) |
| Castro Valley to Oggiono | 5,927.45 mi (9,539.32 km) |
| Castro Valley to Olbia | 6,202.62 mi (9,982.16 km) |
| Castro Valley to Oleggio | 5,916.91 mi (9,522.34 km) |
| Castro Valley to Olgiate Comasco | 5,916.43 mi (9,521.58 km) |
| Castro Valley to Olgiate Olona | 5,922.32 mi (9,531.06 km) |
| Castro Valley to Omegna | 5,895.00 mi (9,487.08 km) |
| Castro Valley to Opera | 5,945.82 mi (9,568.87 km) |
| Castro Valley to Oppeano | 6,006.50 mi (9,666.53 km) |
| Castro Valley to Orbassano | 5,917.15 mi (9,522.74 km) |
