| Opwijk to Oestrich-Winkel | 180.58 mi (290.61 km) |
| Opwijk to Offenburg | 240.57 mi (387.16 km) |
| Opwijk to Oftersheim | 223.79 mi (360.15 km) |
| Opwijk to Ohrdruf | 285.48 mi (459.44 km) |
| Opwijk to Ohringen | 265.36 mi (427.06 km) |
| Opwijk to Olbernhau | 399.71 mi (643.27 km) |
| Opwijk to Olching | 372.12 mi (598.87 km) |
| Opwijk to Oldenburg | 227.87 mi (366.72 km) |
| Opwijk to Oldenburg in Holstein | 363.02 mi (584.23 km) |
| Opwijk to Olfen | 147.50 mi (237.38 km) |
| Opwijk to Olpe | 158.76 mi (255.50 km) |
| Opwijk to Olsberg | 188.18 mi (302.84 km) |
| Opwijk to Oranienburg | 405.26 mi (652.21 km) |
| Opwijk to Ortenberg | 217.48 mi (350.00 km) |
| Opwijk to Oschatz | 387.36 mi (623.39 km) |
