| Rianxo to Orbetello | 1,017.29 mi (1,637.17 km) |
| Rianxo to Oria | 1,369.55 mi (2,204.08 km) |
| Rianxo to Oristano | 921.83 mi (1,483.54 km) |
| Rianxo to Orta Nova | 1,258.48 mi (2,025.33 km) |
| Rianxo to Orte | 1,076.38 mi (1,732.27 km) |
| Rianxo to Ortona | 1,179.14 mi (1,897.63 km) |
| Rianxo to Orvieto | 1,060.17 mi (1,706.18 km) |
| Rianxo to Orzinuovi | 948.38 mi (1,526.27 km) |
| Rianxo to Osimo | 1,123.74 mi (1,808.48 km) |
| Rianxo to Ospitaletto | 956.10 mi (1,538.69 km) |
| Rianxo to Ostuni | 1,362.94 mi (2,193.44 km) |
| Rianxo to Ottaviano | 1,203.34 mi (1,936.59 km) |
| Rianxo to Ovada | 882.12 mi (1,419.63 km) |
| Rianxo to Ozieri | 929.67 mi (1,496.17 km) |
| Rianxo to Paceco | 1,167.32 mi (1,878.63 km) |
