| Viersen to Oberkirch | 202.53 mi (325.94 km) |
| Viersen to Obernburg am Main | 155.19 mi (249.75 km) |
| Viersen to Obernkirchen | 135.67 mi (218.33 km) |
| Viersen to Oberschleissheim | 310.34 mi (499.44 km) |
| Viersen to Oberstdorf | 317.99 mi (511.75 km) |
| Viersen to Obertraubling | 300.54 mi (483.67 km) |
| Viersen to Obertshausen | 134.66 mi (216.72 km) |
| Viersen to Oberursel | 119.90 mi (192.97 km) |
| Viersen to Ochsenfurt | 195.86 mi (315.20 km) |
| Viersen to Ochsenhausen | 271.25 mi (436.53 km) |
| Viersen to Ochtrup | 73.86 mi (118.87 km) |
| Viersen to Odenthal | 34.78 mi (55.97 km) |
| Viersen to Oelde | 85.22 mi (137.15 km) |
| Viersen to Oelsnitz | 258.27 mi (415.65 km) |
| Viersen to Oer-Erkenschwick | 45.42 mi (73.09 km) |
