| Marsta to Orbetello | 1,219.93 mi (1,963.28 km) |
| Marsta to Oria | 1,320.87 mi (2,125.73 km) |
| Marsta to Oristano | 1,420.03 mi (2,285.31 km) |
| Marsta to Orta Nova | 1,266.77 mi (2,038.66 km) |
| Marsta to Orte | 1,207.94 mi (1,943.99 km) |
| Marsta to Ortona | 1,202.02 mi (1,934.46 km) |
| Marsta to Orvieto | 1,192.68 mi (1,919.43 km) |
| Marsta to Orzinuovi | 1,035.43 mi (1,666.36 km) |
| Marsta to Osimo | 1,129.79 mi (1,818.22 km) |
| Marsta to Ospitaletto | 1,023.27 mi (1,646.80 km) |
| Marsta to Ostuni | 1,304.77 mi (2,099.82 km) |
| Marsta to Ottaviano | 1,304.78 mi (2,099.84 km) |
| Marsta to Ovada | 1,103.59 mi (1,776.05 km) |
| Marsta to Ozieri | 1,369.36 mi (2,203.78 km) |
| Marsta to Paceco | 1,512.92 mi (2,434.81 km) |
