| Castelo Branco to Noventa Vicentina | 1,036.70 mi (1,668.41 km) |
| Castelo Branco to Novi di Modena | 1,000.14 mi (1,609.57 km) |
| Castelo Branco to Novi Ligure | 897.73 mi (1,444.75 km) |
| Castelo Branco to Nuoro | 889.42 mi (1,431.38 km) |
| Castelo Branco to Occhiobello | 1,032.95 mi (1,662.37 km) |
| Castelo Branco to Oderzo | 1,090.41 mi (1,754.84 km) |
| Castelo Branco to Oggiono | 945.97 mi (1,522.39 km) |
| Castelo Branco to Olbia | 896.73 mi (1,443.15 km) |
| Castelo Branco to Oleggio | 909.13 mi (1,463.11 km) |
| Castelo Branco to Olgiate Comasco | 928.63 mi (1,494.49 km) |
| Castelo Branco to Olgiate Olona | 921.27 mi (1,482.64 km) |
| Castelo Branco to Omegna | 905.87 mi (1,457.85 km) |
| Castelo Branco to Opera | 930.81 mi (1,497.99 km) |
| Castelo Branco to Oppeano | 1,020.56 mi (1,642.43 km) |
| Castelo Branco to Orbassano | 845.02 mi (1,359.94 km) |
