| Giresun to Oberkirch | 1,565.83 mi (2,519.96 km) |
| Giresun to Obernburg am Main | 1,535.01 mi (2,470.36 km) |
| Giresun to Obernkirchen | 1,580.18 mi (2,543.05 km) |
| Giresun to Oberschleissheim | 1,405.01 mi (2,261.14 km) |
| Giresun to Oberstdorf | 1,454.51 mi (2,340.80 km) |
| Giresun to Obertraubling | 1,388.85 mi (2,235.14 km) |
| Giresun to Obertshausen | 1,551.79 mi (2,497.36 km) |
| Giresun to Oberursel | 1,564.93 mi (2,518.52 km) |
| Giresun to Ochsenfurt | 1,491.82 mi (2,400.86 km) |
| Giresun to Ochsenhausen | 1,476.32 mi (2,375.91 km) |
| Giresun to Ochtrup | 1,657.02 mi (2,666.72 km) |
| Giresun to Odenthal | 1,640.08 mi (2,639.46 km) |
| Giresun to Oelde | 1,610.76 mi (2,592.27 km) |
| Giresun to Oelsnitz | 1,415.81 mi (2,278.53 km) |
| Giresun to Oer-Erkenschwick | 1,644.43 mi (2,646.46 km) |
