| Middelharnis to Orbetello | 722.78 mi (1,163.21 km) |
| Middelharnis to Oria | 1,006.57 mi (1,619.92 km) |
| Middelharnis to Oristano | 845.18 mi (1,360.19 km) |
| Middelharnis to Orta Nova | 902.76 mi (1,452.85 km) |
| Middelharnis to Orte | 748.11 mi (1,203.97 km) |
| Middelharnis to Ortona | 806.91 mi (1,298.60 km) |
| Middelharnis to Orvieto | 725.79 mi (1,168.04 km) |
| Middelharnis to Orzinuovi | 511.40 mi (823.02 km) |
| Middelharnis to Osimo | 716.00 mi (1,152.30 km) |
| Middelharnis to Ospitaletto | 505.39 mi (813.35 km) |
| Middelharnis to Ostuni | 991.89 mi (1,596.29 km) |
| Middelharnis to Ottaviano | 897.67 mi (1,444.65 km) |
| Middelharnis to Ovada | 532.56 mi (857.07 km) |
| Middelharnis to Ozieri | 804.90 mi (1,295.36 km) |
| Middelharnis to Paceco | 1,034.30 mi (1,664.55 km) |
