| Rio Tinto to Orbetello | 1,019.69 mi (1,641.04 km) |
| Rio Tinto to Oria | 1,364.81 mi (2,196.46 km) |
| Rio Tinto to Oristano | 903.36 mi (1,453.82 km) |
| Rio Tinto to Orta Nova | 1,256.65 mi (2,022.38 km) |
| Rio Tinto to Orte | 1,079.43 mi (1,737.18 km) |
| Rio Tinto to Ortona | 1,182.44 mi (1,902.95 km) |
| Rio Tinto to Orvieto | 1,064.84 mi (1,713.69 km) |
| Rio Tinto to Orzinuovi | 972.21 mi (1,564.61 km) |
| Rio Tinto to Osimo | 1,133.75 mi (1,824.59 km) |
| Rio Tinto to Ospitaletto | 980.93 mi (1,578.65 km) |
| Rio Tinto to Ostuni | 1,359.37 mi (2,187.69 km) |
| Rio Tinto to Ottaviano | 1,197.74 mi (1,927.58 km) |
| Rio Tinto to Ovada | 901.07 mi (1,450.14 km) |
| Rio Tinto to Ozieri | 916.85 mi (1,475.52 km) |
| Rio Tinto to Paceco | 1,142.63 mi (1,838.89 km) |
