| Alton to Oberkirch | 441.95 mi (711.25 km) |
| Alton to Obernburg am Main | 453.46 mi (729.77 km) |
| Alton to Obernkirchen | 438.66 mi (705.95 km) |
| Alton to Oberschleissheim | 594.38 mi (956.57 km) |
| Alton to Oberstdorf | 568.55 mi (915.00 km) |
| Alton to Obertraubling | 601.35 mi (967.77 km) |
| Alton to Obertshausen | 436.27 mi (702.12 km) |
| Alton to Oberursel | 423.07 mi (680.87 km) |
| Alton to Ochsenfurt | 496.79 mi (799.50 km) |
| Alton to Ochsenhausen | 532.67 mi (857.25 km) |
| Alton to Ochtrup | 357.23 mi (574.91 km) |
| Alton to Odenthal | 351.14 mi (565.11 km) |
| Alton to Oelde | 395.20 mi (636.01 km) |
| Alton to Oelsnitz | 575.63 mi (926.38 km) |
| Alton to Oer-Erkenschwick | 356.13 mi (573.14 km) |
