| Kocaeli to Oberkirch | 1,194.29 mi (1,922.03 km) |
| Kocaeli to Obernburg am Main | 1,182.59 mi (1,903.19 km) |
| Kocaeli to Obernkirchen | 1,260.92 mi (2,029.26 km) |
| Kocaeli to Oberschleissheim | 1,037.94 mi (1,670.40 km) |
| Kocaeli to Oberstdorf | 1,073.44 mi (1,727.53 km) |
| Kocaeli to Obertraubling | 1,033.81 mi (1,663.75 km) |
| Kocaeli to Obertshausen | 1,201.50 mi (1,933.63 km) |
| Kocaeli to Oberursel | 1,215.73 mi (1,956.53 km) |
| Kocaeli to Ochsenfurt | 1,139.56 mi (1,833.94 km) |
| Kocaeli to Ochsenhausen | 1,102.88 mi (1,774.91 km) |
| Kocaeli to Ochtrup | 1,330.14 mi (2,140.65 km) |
| Kocaeli to Odenthal | 1,297.65 mi (2,088.37 km) |
| Kocaeli to Oelde | 1,282.05 mi (2,063.26 km) |
| Kocaeli to Oelsnitz | 1,082.29 mi (1,741.78 km) |
| Kocaeli to Oer-Erkenschwick | 1,310.31 mi (2,108.73 km) |
