| Boo to Nasaud | 868.52 mi (1,397.76 km) |
| Boo to Navodari | 1,123.61 mi (1,808.28 km) |
| Boo to Negresti-Oas | 818.29 mi (1,316.91 km) |
| Boo to Nehoiu | 1,021.22 mi (1,643.49 km) |
| Boo to Ocna Mures | 922.51 mi (1,484.63 km) |
| Boo to Odobesti | 1,004.82 mi (1,617.10 km) |
| Boo to Odorheiu Secuiesc | 944.17 mi (1,519.50 km) |
| Boo to Oltenita | 1,109.83 mi (1,786.09 km) |
| Boo to Onesti | 968.08 mi (1,557.97 km) |
| Boo to Oradea | 859.22 mi (1,382.79 km) |
| Boo to Orastie | 952.73 mi (1,533.27 km) |
| Boo to Oravita | 996.75 mi (1,604.12 km) |
| Boo to Orsova | 1,022.97 mi (1,646.31 km) |
| Boo to Otelu Rosu | 968.45 mi (1,558.57 km) |
| Boo to Otopeni | 1,071.55 mi (1,724.49 km) |
