| Mechelen-aan-de-Maas to Oestrich-Winkel | 122.21 mi (196.68 km) |
| Mechelen-aan-de-Maas to Offenburg | 201.18 mi (323.77 km) |
| Mechelen-aan-de-Maas to Oftersheim | 169.93 mi (273.47 km) |
| Mechelen-aan-de-Maas to Ohrdruf | 219.41 mi (353.10 km) |
| Mechelen-aan-de-Maas to Ohringen | 209.10 mi (336.51 km) |
| Mechelen-aan-de-Maas to Olbernhau | 333.63 mi (536.93 km) |
| Mechelen-aan-de-Maas to Olching | 316.95 mi (510.08 km) |
| Mechelen-aan-de-Maas to Oldenburg | 182.70 mi (294.02 km) |
| Mechelen-aan-de-Maas to Oldenburg in Holstein | 314.89 mi (506.77 km) |
| Mechelen-aan-de-Maas to Olfen | 87.94 mi (141.53 km) |
| Mechelen-aan-de-Maas to Olpe | 92.64 mi (149.10 km) |
| Mechelen-aan-de-Maas to Olsberg | 122.90 mi (197.79 km) |
| Mechelen-aan-de-Maas to Oranienburg | 343.37 mi (552.59 km) |
| Mechelen-aan-de-Maas to Ortenberg | 153.32 mi (246.74 km) |
| Mechelen-aan-de-Maas to Oschatz | 321.49 mi (517.38 km) |
