| Cal to Orbetello | 1,002.69 mi (1,613.68 km) |
| Cal to Oria | 650.36 mi (1,046.65 km) |
| Cal to Oristano | 1,121.84 mi (1,805.43 km) |
| Cal to Orta Nova | 760.40 mi (1,223.75 km) |
| Cal to Orte | 944.51 mi (1,520.04 km) |
| Cal to Ortona | 843.04 mi (1,356.74 km) |
| Cal to Orvieto | 962.27 mi (1,548.62 km) |
| Cal to Orzinuovi | 1,119.67 mi (1,801.94 km) |
| Cal to Osimo | 910.45 mi (1,465.23 km) |
| Cal to Ospitaletto | 1,117.04 mi (1,797.70 km) |
| Cal to Ostuni | 656.20 mi (1,056.05 km) |
| Cal to Ottaviano | 817.42 mi (1,315.50 km) |
| Cal to Ovada | 1,163.44 mi (1,872.37 km) |
| Cal to Ozieri | 1,101.02 mi (1,771.92 km) |
| Cal to Paceco | 915.71 mi (1,473.69 km) |
