| Viersen to Oerlinghausen | 109.05 mi (175.49 km) |
| Viersen to Oestrich-Winkel | 111.65 mi (179.68 km) |
| Viersen to Offenburg | 204.50 mi (329.11 km) |
| Viersen to Oftersheim | 162.12 mi (260.90 km) |
| Viersen to Ohrdruf | 190.63 mi (306.78 km) |
| Viersen to Ohringen | 197.43 mi (317.73 km) |
| Viersen to Olbernhau | 304.46 mi (489.98 km) |
| Viersen to Olching | 304.61 mi (490.22 km) |
| Viersen to Oldenburg | 151.42 mi (243.69 km) |
| Viersen to Oldenburg in Holstein | 281.64 mi (453.26 km) |
| Viersen to Olfen | 53.03 mi (85.35 km) |
| Viersen to Olpe | 64.42 mi (103.67 km) |
| Viersen to Olsberg | 90.34 mi (145.39 km) |
| Viersen to Oranienburg | 308.64 mi (496.70 km) |
| Viersen to Ortenberg | 131.67 mi (211.90 km) |
