| Gahanna to Oberkirch | 4,265.53 mi (6,864.71 km) |
| Gahanna to Obernburg am Main | 4,262.44 mi (6,859.74 km) |
| Gahanna to Obernkirchen | 4,180.16 mi (6,727.32 km) |
| Gahanna to Oberschleissheim | 4,412.95 mi (7,101.96 km) |
| Gahanna to Oberstdorf | 4,392.45 mi (7,068.96 km) |
| Gahanna to Obertraubling | 4,410.23 mi (7,097.57 km) |
| Gahanna to Obertshausen | 4,242.81 mi (6,828.14 km) |
| Gahanna to Oberursel | 4,228.29 mi (6,804.78 km) |
| Gahanna to Ochsenfurt | 4,304.79 mi (6,927.89 km) |
| Gahanna to Ochsenhausen | 4,355.61 mi (7,009.68 km) |
| Gahanna to Ochtrup | 4,110.02 mi (6,614.44 km) |
| Gahanna to Odenthal | 4,144.68 mi (6,670.22 km) |
| Gahanna to Oelde | 4,158.10 mi (6,691.82 km) |
| Gahanna to Oelsnitz | 4,357.86 mi (7,013.29 km) |
| Gahanna to Oer-Erkenschwick | 4,130.24 mi (6,646.98 km) |
