| Opmeer to Oberkirch | 318.91 mi (513.23 km) |
| Opmeer to Obernburg am Main | 268.01 mi (431.32 km) |
| Opmeer to Obernkirchen | 177.88 mi (286.28 km) |
| Opmeer to Oberschleissheim | 422.97 mi (680.70 km) |
| Opmeer to Oberstdorf | 435.05 mi (700.14 km) |
| Opmeer to Obertraubling | 406.79 mi (654.67 km) |
| Opmeer to Obertshausen | 247.20 mi (397.84 km) |
| Opmeer to Oberursel | 232.63 mi (374.39 km) |
| Opmeer to Ochsenfurt | 305.70 mi (491.97 km) |
| Opmeer to Ochsenhausen | 388.02 mi (624.47 km) |
| Opmeer to Ochtrup | 100.32 mi (161.45 km) |
| Opmeer to Odenthal | 147.66 mi (237.63 km) |
| Opmeer to Oelde | 147.95 mi (238.10 km) |
| Opmeer to Oelsnitz | 347.62 mi (559.44 km) |
| Opmeer to Oer-Erkenschwick | 121.84 mi (196.08 km) |
