| Alken to Obernburg am Main | 183.50 mi (295.31 km) |
| Alken to Obernkirchen | 189.70 mi (305.29 km) |
| Alken to Oberschleissheim | 333.89 mi (537.34 km) |
| Alken to Oberstdorf | 328.27 mi (528.29 km) |
| Alken to Obertraubling | 332.29 mi (534.76 km) |
| Alken to Obertshausen | 164.79 mi (265.21 km) |
| Alken to Oberursel | 150.88 mi (242.81 km) |
| Alken to Ochsenfurt | 226.57 mi (364.63 km) |
| Alken to Ochsenhausen | 284.39 mi (457.68 km) |
| Alken to Ochtrup | 122.39 mi (196.97 km) |
| Alken to Odenthal | 79.47 mi (127.90 km) |
| Alken to Oelde | 139.32 mi (224.21 km) |
| Alken to Oelsnitz | 302.07 mi (486.13 km) |
| Alken to Oer-Erkenschwick | 99.29 mi (159.80 km) |
| Alken to Oerlinghausen | 163.14 mi (262.55 km) |
