| Os to Orbetello | 1,252.56 mi (2,015.80 km) |
| Os to Oria | 1,459.08 mi (2,348.16 km) |
| Os to Oristano | 1,410.46 mi (2,269.91 km) |
| Os to Orta Nova | 1,376.29 mi (2,214.93 km) |
| Os to Orte | 1,261.62 mi (2,030.38 km) |
| Os to Ortona | 1,291.24 mi (2,078.04 km) |
| Os to Orvieto | 1,241.47 mi (1,997.96 km) |
| Os to Orzinuovi | 1,040.63 mi (1,674.73 km) |
| Os to Osimo | 1,204.20 mi (1,937.98 km) |
| Os to Ospitaletto | 1,031.05 mi (1,659.32 km) |
| Os to Ostuni | 1,442.89 mi (2,322.11 km) |
| Os to Ottaviano | 1,392.96 mi (2,241.76 km) |
| Os to Ovada | 1,084.95 mi (1,746.05 km) |
| Os to Ozieri | 1,365.52 mi (2,197.59 km) |
| Os to Paceco | 1,567.75 mi (2,523.05 km) |
