| Langen to Obernburg am Main | 23.33 mi (37.54 km) |
| Langen to Obernkirchen | 158.95 mi (255.81 km) |
| Langen to Oberschleissheim | 177.58 mi (285.78 km) |
| Langen to Oberstdorf | 192.41 mi (309.66 km) |
| Langen to Obertraubling | 172.13 mi (277.02 km) |
| Langen to Obertshausen | 9.38 mi (15.09 km) |
| Langen to Oberursel | 15.71 mi (25.29 km) |
| Langen to Ochsenfurt | 66.53 mi (107.06 km) |
| Langen to Ochsenhausen | 144.24 mi (232.13 km) |
| Langen to Ochtrup | 166.37 mi (267.74 km) |
| Langen to Odenthal | 99.50 mi (160.14 km) |
| Langen to Oelde | 129.79 mi (208.87 km) |
| Langen to Oelsnitz | 157.65 mi (253.71 km) |
| Langen to Oer-Erkenschwick | 130.22 mi (209.57 km) |
| Langen to Oerlinghausen | 137.04 mi (220.54 km) |
