| The Dalles to Oberkirch | 5,249.84 mi (8,448.80 km) |
| The Dalles to Obernburg am Main | 5,201.24 mi (8,370.59 km) |
| The Dalles to Obernkirchen | 5,061.14 mi (8,145.11 km) |
| The Dalles to Oberschleissheim | 5,352.96 mi (8,614.76 km) |
| The Dalles to Oberstdorf | 5,370.40 mi (8,642.83 km) |
| The Dalles to Obertraubling | 5,325.21 mi (8,570.10 km) |
| The Dalles to Obertshausen | 5,180.62 mi (8,337.40 km) |
| The Dalles to Oberursel | 5,166.46 mi (8,314.61 km) |
| The Dalles to Ochsenfurt | 5,234.83 mi (8,424.65 km) |
| The Dalles to Ochsenhausen | 5,323.55 mi (8,567.43 km) |
| The Dalles to Ochtrup | 5,018.44 mi (8,076.40 km) |
| The Dalles to Odenthal | 5,082.98 mi (8,180.27 km) |
| The Dalles to Oelde | 5,062.83 mi (8,147.84 km) |
| The Dalles to Oelsnitz | 5,239.78 mi (8,432.62 km) |
| The Dalles to Oer-Erkenschwick | 5,051.80 mi (8,130.09 km) |
