| Peso da Regua to Orbetello | 979.93 mi (1,577.04 km) |
| Peso da Regua to Oria | 1,324.43 mi (2,131.46 km) |
| Peso da Regua to Oristano | 862.61 mi (1,388.23 km) |
| Peso da Regua to Orta Nova | 1,216.47 mi (1,957.71 km) |
| Peso da Regua to Orte | 1,039.70 mi (1,673.23 km) |
| Peso da Regua to Ortona | 1,142.68 mi (1,838.97 km) |
| Peso da Regua to Orvieto | 1,025.26 mi (1,650.00 km) |
| Peso da Regua to Orzinuovi | 935.30 mi (1,505.22 km) |
| Peso da Regua to Osimo | 1,094.70 mi (1,761.75 km) |
| Peso da Regua to Ospitaletto | 944.19 mi (1,519.53 km) |
| Peso da Regua to Ostuni | 1,319.05 mi (2,122.80 km) |
| Peso da Regua to Ottaviano | 1,157.34 mi (1,862.56 km) |
| Peso da Regua to Ovada | 863.44 mi (1,389.57 km) |
| Peso da Regua to Ozieri | 876.20 mi (1,410.10 km) |
| Peso da Regua to Paceco | 1,101.93 mi (1,773.39 km) |
