| Summit to Orbetello | 4,221.45 mi (6,793.76 km) |
| Summit to Oria | 4,573.99 mi (7,361.13 km) |
| Summit to Oristano | 4,192.21 mi (6,746.71 km) |
| Summit to Orta Nova | 4,458.64 mi (7,175.48 km) |
| Summit to Orte | 4,272.22 mi (6,875.47 km) |
| Summit to Ortona | 4,363.92 mi (7,023.04 km) |
| Summit to Orvieto | 4,251.05 mi (6,841.40 km) |
| Summit to Orzinuovi | 4,065.90 mi (6,543.43 km) |
| Summit to Osimo | 4,283.53 mi (6,893.67 km) |
| Summit to Ospitaletto | 4,066.81 mi (6,544.89 km) |
| Summit to Ostuni | 4,562.79 mi (7,343.10 km) |
| Summit to Ottaviano | 4,422.53 mi (7,117.38 km) |
| Summit to Ovada | 4,035.18 mi (6,494.00 km) |
| Summit to Ozieri | 4,187.29 mi (6,738.80 km) |
| Summit to Paceco | 4,442.95 mi (7,150.24 km) |
