| Giesen to Obernburg am Main | 166.22 mi (267.50 km) |
| Giesen to Obernkirchen | 32.72 mi (52.65 km) |
| Giesen to Oberschleissheim | 282.86 mi (455.22 km) |
| Giesen to Oberstdorf | 331.45 mi (533.41 km) |
| Giesen to Obertraubling | 244.86 mi (394.07 km) |
| Giesen to Obertshausen | 154.26 mi (248.26 km) |
| Giesen to Oberursel | 149.10 mi (239.95 km) |
| Giesen to Ochsenfurt | 176.37 mi (283.84 km) |
| Giesen to Ochsenhausen | 285.22 mi (459.01 km) |
| Giesen to Ochtrup | 114.03 mi (183.51 km) |
| Giesen to Odenthal | 143.46 mi (230.88 km) |
| Giesen to Oelde | 77.93 mi (125.42 km) |
| Giesen to Oelsnitz | 157.81 mi (253.97 km) |
| Giesen to Oer-Erkenschwick | 118.61 mi (190.88 km) |
| Giesen to Oerlinghausen | 54.11 mi (87.08 km) |
