| Ross on Wye to Orbetello | 918.25 mi (1,477.77 km) |
| Ross on Wye to Oria | 1,240.36 mi (1,996.16 km) |
| Ross on Wye to Oristano | 986.03 mi (1,586.87 km) |
| Ross on Wye to Orta Nova | 1,129.57 mi (1,817.87 km) |
| Ross on Wye to Orte | 956.25 mi (1,538.93 km) |
| Ross on Wye to Ortona | 1,032.02 mi (1,660.88 km) |
| Ross on Wye to Orvieto | 933.61 mi (1,502.50 km) |
| Ross on Wye to Orzinuovi | 725.71 mi (1,167.92 km) |
| Ross on Wye to Osimo | 943.98 mi (1,519.19 km) |
| Ross on Wye to Ospitaletto | 723.49 mi (1,164.34 km) |
| Ross on Wye to Ostuni | 1,226.94 mi (1,974.57 km) |
| Ross on Wye to Ottaviano | 1,111.08 mi (1,788.11 km) |
| Ross on Wye to Ovada | 719.23 mi (1,157.49 km) |
| Ross on Wye to Ozieri | 956.33 mi (1,539.06 km) |
| Ross on Wye to Paceco | 1,209.11 mi (1,945.87 km) |
