| Altena to Obernburg am Main | 119.84 mi (192.87 km) |
| Altena to Obernkirchen | 91.13 mi (146.66 km) |
| Altena to Oberschleissheim | 273.22 mi (439.70 km) |
| Altena to Oberstdorf | 293.34 mi (472.08 km) |
| Altena to Obertraubling | 256.31 mi (412.49 km) |
| Altena to Obertshausen | 99.34 mi (159.88 km) |
| Altena to Oberursel | 85.58 mi (137.73 km) |
| Altena to Ochsenfurt | 155.33 mi (249.99 km) |
| Altena to Ochsenhausen | 245.20 mi (394.61 km) |
| Altena to Ochtrup | 65.80 mi (105.90 km) |
| Altena to Odenthal | 30.12 mi (48.48 km) |
| Altena to Oelde | 42.29 mi (68.06 km) |
| Altena to Oelsnitz | 205.50 mi (330.71 km) |
| Altena to Oer-Erkenschwick | 29.66 mi (47.73 km) |
| Altena to Oerlinghausen | 62.94 mi (101.29 km) |
