| Cay to Oberkirch | 1,330.63 mi (2,141.45 km) |
| Cay to Obernburg am Main | 1,325.53 mi (2,133.24 km) |
| Cay to Obernkirchen | 1,411.47 mi (2,271.53 km) |
| Cay to Oberschleissheim | 1,177.42 mi (1,894.88 km) |
| Cay to Oberstdorf | 1,207.01 mi (1,942.49 km) |
| Cay to Obertraubling | 1,177.29 mi (1,894.66 km) |
| Cay to Obertshausen | 1,344.93 mi (2,164.45 km) |
| Cay to Oberursel | 1,359.36 mi (2,187.68 km) |
| Cay to Ochsenfurt | 1,282.90 mi (2,064.63 km) |
| Cay to Ochsenhausen | 1,239.32 mi (1,994.49 km) |
| Cay to Ochtrup | 1,478.67 mi (2,379.69 km) |
| Cay to Odenthal | 1,442.59 mi (2,321.62 km) |
| Cay to Oelde | 1,430.46 mi (2,302.10 km) |
| Cay to Oelsnitz | 1,231.01 mi (1,981.12 km) |
| Cay to Oer-Erkenschwick | 1,457.28 mi (2,345.27 km) |
