| Herk-de-Stad to Oria | 936.54 mi (1,507.21 km) |
| Herk-de-Stad to Oristano | 780.08 mi (1,255.42 km) |
| Herk-de-Stad to Orta Nova | 832.35 mi (1,339.54 km) |
| Herk-de-Stad to Orte | 677.72 mi (1,090.69 km) |
| Herk-de-Stad to Ortona | 736.42 mi (1,185.15 km) |
| Herk-de-Stad to Orvieto | 655.42 mi (1,054.80 km) |
| Herk-de-Stad to Orzinuovi | 441.12 mi (709.92 km) |
| Herk-de-Stad to Osimo | 645.53 mi (1,038.88 km) |
| Herk-de-Stad to Ospitaletto | 434.98 mi (700.03 km) |
| Herk-de-Stad to Ostuni | 921.92 mi (1,483.68 km) |
| Herk-de-Stad to Ottaviano | 827.11 mi (1,331.11 km) |
| Herk-de-Stad to Ovada | 464.24 mi (747.12 km) |
| Herk-de-Stad to Ozieri | 738.75 mi (1,188.90 km) |
| Herk-de-Stad to Paceco | 965.27 mi (1,553.45 km) |
| Herk-de-Stad to Pachino | 1,098.14 mi (1,767.29 km) |
