| Mentor to Oberkirch | 4,130.09 mi (6,646.73 km) |
| Mentor to Obernburg am Main | 4,126.01 mi (6,640.17 km) |
| Mentor to Obernkirchen | 4,042.53 mi (6,505.82 km) |
| Mentor to Oberschleissheim | 4,276.87 mi (6,882.96 km) |
| Mentor to Oberstdorf | 4,257.15 mi (6,851.22 km) |
| Mentor to Obertraubling | 4,273.63 mi (6,877.75 km) |
| Mentor to Obertshausen | 4,106.32 mi (6,608.48 km) |
| Mentor to Oberursel | 4,091.78 mi (6,585.08 km) |
| Mentor to Ochsenfurt | 4,168.28 mi (6,708.19 km) |
| Mentor to Ochsenhausen | 4,220.00 mi (6,791.44 km) |
| Mentor to Ochtrup | 3,972.71 mi (6,393.46 km) |
| Mentor to Odenthal | 4,007.99 mi (6,450.24 km) |
| Mentor to Oelde | 4,020.82 mi (6,470.89 km) |
| Mentor to Oelsnitz | 4,220.56 mi (6,792.34 km) |
| Mentor to Oer-Erkenschwick | 3,993.21 mi (6,426.44 km) |
