| Mountain Top to Oberkirch | 3,935.75 mi (6,333.98 km) |
| Mountain Top to Obernburg am Main | 3,938.04 mi (6,337.66 km) |
| Mountain Top to Obernkirchen | 3,864.15 mi (6,218.75 km) |
| Mountain Top to Oberschleissheim | 4,086.31 mi (6,576.28 km) |
| Mountain Top to Oberstdorf | 4,061.73 mi (6,536.72 km) |
| Mountain Top to Obertraubling | 4,086.55 mi (6,576.67 km) |
| Mountain Top to Obertshausen | 3,918.81 mi (6,306.72 km) |
| Mountain Top to Oberursel | 3,904.46 mi (6,283.62 km) |
| Mountain Top to Ochsenfurt | 3,980.83 mi (6,406.52 km) |
| Mountain Top to Ochsenhausen | 4,026.51 mi (6,480.05 km) |
| Mountain Top to Ochtrup | 3,791.67 mi (6,102.10 km) |
| Mountain Top to Odenthal | 3,822.08 mi (6,151.05 km) |
| Mountain Top to Oelde | 3,839.45 mi (6,179.00 km) |
| Mountain Top to Oelsnitz | 4,038.94 mi (6,500.04 km) |
| Mountain Top to Oer-Erkenschwick | 3,809.93 mi (6,131.48 km) |
