| Gebze to Oberkirch | 1,171.87 mi (1,885.95 km) |
| Gebze to Obernburg am Main | 1,161.31 mi (1,868.95 km) |
| Gebze to Obernkirchen | 1,241.54 mi (1,998.06 km) |
| Gebze to Oberschleissheim | 1,015.97 mi (1,635.04 km) |
| Gebze to Oberstdorf | 1,050.58 mi (1,690.75 km) |
| Gebze to Obertraubling | 1,012.59 mi (1,629.60 km) |
| Gebze to Obertshausen | 1,180.32 mi (1,899.55 km) |
| Gebze to Oberursel | 1,194.60 mi (1,922.52 km) |
| Gebze to Ochsenfurt | 1,118.35 mi (1,799.81 km) |
| Gebze to Ochsenhausen | 1,080.44 mi (1,738.81 km) |
| Gebze to Ochtrup | 1,310.19 mi (2,108.55 km) |
| Gebze to Odenthal | 1,276.82 mi (2,054.84 km) |
| Gebze to Oelde | 1,262.06 mi (2,031.08 km) |
| Gebze to Oelsnitz | 1,062.33 mi (1,709.66 km) |
| Gebze to Oer-Erkenschwick | 1,289.95 mi (2,075.98 km) |
