| Bad Ems to Obernburg am Main | 72.16 mi (116.13 km) |
| Bad Ems to Obernkirchen | 146.44 mi (235.67 km) |
| Bad Ems to Oberschleissheim | 225.80 mi (363.38 km) |
| Bad Ems to Oberstdorf | 233.55 mi (375.87 km) |
| Bad Ems to Obertraubling | 220.70 mi (355.18 km) |
| Bad Ems to Obertshausen | 53.07 mi (85.41 km) |
| Bad Ems to Oberursel | 39.37 mi (63.37 km) |
| Bad Ems to Ochsenfurt | 114.94 mi (184.98 km) |
| Bad Ems to Ochsenhausen | 186.29 mi (299.81 km) |
| Bad Ems to Ochtrup | 130.98 mi (210.79 km) |
| Bad Ems to Odenthal | 54.62 mi (87.90 km) |
| Bad Ems to Oelde | 105.05 mi (169.07 km) |
| Bad Ems to Oelsnitz | 196.39 mi (316.06 km) |
| Bad Ems to Oer-Erkenschwick | 92.30 mi (148.54 km) |
| Bad Ems to Oerlinghausen | 119.91 mi (192.98 km) |
