| Castelo Branco to Navodari | 1,862.77 mi (2,997.83 km) |
| Castelo Branco to Negresti-Oas | 1,625.33 mi (2,615.72 km) |
| Castelo Branco to Nehoiu | 1,748.09 mi (2,813.28 km) |
| Castelo Branco to Ocna Mures | 1,633.88 mi (2,629.47 km) |
| Castelo Branco to Odobesti | 1,785.29 mi (2,873.14 km) |
| Castelo Branco to Odorheiu Secuiesc | 1,702.08 mi (2,739.24 km) |
| Castelo Branco to Oltenita | 1,765.75 mi (2,841.69 km) |
| Castelo Branco to Onesti | 1,771.89 mi (2,851.58 km) |
| Castelo Branco to Oradea | 1,547.90 mi (2,491.10 km) |
| Castelo Branco to Orastie | 1,599.49 mi (2,574.13 km) |
| Castelo Branco to Oravita | 1,522.58 mi (2,450.36 km) |
| Castelo Branco to Orsova | 1,556.32 mi (2,504.65 km) |
| Castelo Branco to Otelu Rosu | 1,557.09 mi (2,505.90 km) |
| Castelo Branco to Otopeni | 1,736.81 mi (2,795.13 km) |
| Castelo Branco to Ovidiu | 1,860.33 mi (2,993.91 km) |
