| Ridge to Oberkirch | 3,820.84 mi (6,149.05 km) |
| Ridge to Obernburg am Main | 3,826.57 mi (6,158.26 km) |
| Ridge to Obernkirchen | 3,758.02 mi (6,047.94 km) |
| Ridge to Oberschleissheim | 3,973.20 mi (6,394.25 km) |
| Ridge to Oberstdorf | 3,946.04 mi (6,350.54 km) |
| Ridge to Obertraubling | 3,975.32 mi (6,397.66 km) |
| Ridge to Obertshausen | 3,807.62 mi (6,127.78 km) |
| Ridge to Oberursel | 3,793.40 mi (6,104.89 km) |
| Ridge to Ochsenfurt | 3,869.57 mi (6,227.47 km) |
| Ridge to Ochsenhausen | 3,911.92 mi (6,295.62 km) |
| Ridge to Ochtrup | 3,684.22 mi (5,929.18 km) |
| Ridge to Odenthal | 3,711.93 mi (5,973.77 km) |
| Ridge to Oelde | 3,731.73 mi (6,005.64 km) |
| Ridge to Oelsnitz | 3,930.73 mi (6,325.90 km) |
| Ridge to Oer-Erkenschwick | 3,701.22 mi (5,956.54 km) |
