| Heemskerk to Orbetello | 759.66 mi (1,222.55 km) |
| Heemskerk to Oria | 1,030.85 mi (1,658.99 km) |
| Heemskerk to Oristano | 890.96 mi (1,433.87 km) |
| Heemskerk to Orta Nova | 929.88 mi (1,496.50 km) |
| Heemskerk to Orte | 781.70 mi (1,258.02 km) |
| Heemskerk to Ortona | 835.25 mi (1,344.20 km) |
| Heemskerk to Orvieto | 759.66 mi (1,222.55 km) |
| Heemskerk to Orzinuovi | 546.34 mi (879.25 km) |
| Heemskerk to Osimo | 744.25 mi (1,197.75 km) |
| Heemskerk to Ospitaletto | 539.38 mi (868.05 km) |
| Heemskerk to Ostuni | 1,015.81 mi (1,634.79 km) |
| Heemskerk to Ottaviano | 928.70 mi (1,494.60 km) |
| Heemskerk to Ovada | 573.65 mi (923.21 km) |
| Heemskerk to Ozieri | 849.37 mi (1,366.93 km) |
| Heemskerk to Paceco | 1,073.34 mi (1,727.37 km) |
