| Kastamonu to Oberkirch | 1,342.10 mi (2,159.91 km) |
| Kastamonu to Obernburg am Main | 1,318.31 mi (2,121.62 km) |
| Kastamonu to Obernkirchen | 1,376.97 mi (2,216.02 km) |
| Kastamonu to Oberschleissheim | 1,182.20 mi (1,902.57 km) |
| Kastamonu to Oberstdorf | 1,226.97 mi (1,974.62 km) |
| Kastamonu to Obertraubling | 1,170.37 mi (1,883.53 km) |
| Kastamonu to Obertshausen | 1,335.99 mi (2,150.07 km) |
| Kastamonu to Oberursel | 1,349.62 mi (2,172.01 km) |
| Kastamonu to Ochsenfurt | 1,274.97 mi (2,051.86 km) |
| Kastamonu to Ochsenhausen | 1,251.56 mi (2,014.18 km) |
| Kastamonu to Ochtrup | 1,451.10 mi (2,335.32 km) |
| Kastamonu to Odenthal | 1,427.79 mi (2,297.81 km) |
| Kastamonu to Oelde | 1,403.85 mi (2,259.27 km) |
| Kastamonu to Oelsnitz | 1,205.78 mi (1,940.51 km) |
| Kastamonu to Oer-Erkenschwick | 1,435.49 mi (2,310.21 km) |
