| Neder-Over-Heembeek to Oria | 958.94 mi (1,543.26 km) |
| Neder-Over-Heembeek to Oristano | 786.24 mi (1,265.33 km) |
| Neder-Over-Heembeek to Orta Nova | 853.30 mi (1,373.25 km) |
| Neder-Over-Heembeek to Orte | 694.75 mi (1,118.10 km) |
| Neder-Over-Heembeek to Ortona | 756.81 mi (1,217.97 km) |
| Neder-Over-Heembeek to Orvieto | 672.29 mi (1,081.95 km) |
| Neder-Over-Heembeek to Orzinuovi | 457.82 mi (736.79 km) |
| Neder-Over-Heembeek to Osimo | 666.18 mi (1,072.12 km) |
| Neder-Over-Heembeek to Ospitaletto | 452.43 mi (728.12 km) |
| Neder-Over-Heembeek to Ostuni | 944.53 mi (1,520.07 km) |
| Neder-Over-Heembeek to Ottaviano | 845.64 mi (1,360.93 km) |
| Neder-Over-Heembeek to Ovada | 475.53 mi (765.29 km) |
| Neder-Over-Heembeek to Ozieri | 746.33 mi (1,201.10 km) |
| Neder-Over-Heembeek to Paceco | 977.74 mi (1,573.51 km) |
| Neder-Over-Heembeek to Pachino | 1,113.54 mi (1,792.07 km) |
