| Viersen to Novi di Modena | 486.08 mi (782.27 km) |
| Viersen to Novi Ligure | 462.20 mi (743.84 km) |
| Viersen to Nuoro | 768.80 mi (1,237.26 km) |
| Viersen to Occhiobello | 498.50 mi (802.26 km) |
| Viersen to Oderzo | 469.69 mi (755.90 km) |
| Viersen to Oggiono | 401.47 mi (646.10 km) |
| Viersen to Olbia | 729.52 mi (1,174.04 km) |
| Viersen to Oleggio | 403.97 mi (650.13 km) |
| Viersen to Olgiate Comasco | 395.93 mi (637.19 km) |
| Viersen to Olgiate Olona | 404.80 mi (651.46 km) |
| Viersen to Omegna | 382.74 mi (615.95 km) |
| Viersen to Opera | 425.86 mi (685.36 km) |
| Viersen to Oppeano | 466.44 mi (750.66 km) |
| Viersen to Orbassano | 434.92 mi (699.94 km) |
| Viersen to Orbetello | 649.93 mi (1,045.96 km) |
