| Colonia to Oberkirch | 3,893.51 mi (6,265.99 km) |
| Colonia to Obernburg am Main | 3,898.31 mi (6,273.72 km) |
| Colonia to Obernkirchen | 3,828.23 mi (6,160.94 km) |
| Colonia to Oberschleissheim | 4,045.40 mi (6,510.45 km) |
| Colonia to Oberstdorf | 4,018.92 mi (6,467.83 km) |
| Colonia to Obertraubling | 4,047.01 mi (6,513.04 km) |
| Colonia to Obertshausen | 3,879.28 mi (6,243.10 km) |
| Colonia to Oberursel | 3,865.02 mi (6,220.15 km) |
| Colonia to Ochsenfurt | 3,941.25 mi (6,342.83 km) |
| Colonia to Ochsenhausen | 3,984.51 mi (6,412.45 km) |
| Colonia to Ochtrup | 3,754.81 mi (6,042.78 km) |
| Colonia to Odenthal | 3,783.29 mi (6,088.61 km) |
| Colonia to Oelde | 3,802.40 mi (6,119.37 km) |
| Colonia to Oelsnitz | 4,001.57 mi (6,439.90 km) |
| Colonia to Oer-Erkenschwick | 3,772.17 mi (6,070.73 km) |
