| Herzogenrath to Novi di Modena | 468.62 mi (754.17 km) |
| Herzogenrath to Novi Ligure | 439.92 mi (707.99 km) |
| Herzogenrath to Nuoro | 745.32 mi (1,199.47 km) |
| Herzogenrath to Occhiobello | 482.61 mi (776.68 km) |
| Herzogenrath to Oderzo | 457.62 mi (736.47 km) |
| Herzogenrath to Oggiono | 381.55 mi (614.05 km) |
| Herzogenrath to Olbia | 706.45 mi (1,136.92 km) |
| Herzogenrath to Oleggio | 382.05 mi (614.86 km) |
| Herzogenrath to Olgiate Comasco | 375.03 mi (603.56 km) |
| Herzogenrath to Olgiate Olona | 383.52 mi (617.22 km) |
| Herzogenrath to Omegna | 360.53 mi (580.21 km) |
| Herzogenrath to Opera | 405.12 mi (651.98 km) |
| Herzogenrath to Oppeano | 450.29 mi (724.67 km) |
| Herzogenrath to Orbassano | 410.25 mi (660.23 km) |
| Herzogenrath to Orbetello | 630.35 mi (1,014.46 km) |
