| Ballwin to Oberkirch | 4,633.43 mi (7,456.79 km) |
| Ballwin to Obernburg am Main | 4,624.26 mi (7,442.02 km) |
| Ballwin to Obernkirchen | 4,532.87 mi (7,294.95 km) |
| Ballwin to Oberschleissheim | 4,776.81 mi (7,687.53 km) |
| Ballwin to Oberstdorf | 4,761.02 mi (7,662.12 km) |
| Ballwin to Obertraubling | 4,770.70 mi (7,677.70 km) |
| Ballwin to Obertshausen | 4,604.24 mi (7,409.81 km) |
| Ballwin to Oberursel | 4,589.58 mi (7,386.22 km) |
| Ballwin to Ochsenfurt | 4,665.96 mi (7,509.14 km) |
| Ballwin to Ochsenhausen | 4,722.45 mi (7,600.05 km) |
| Ballwin to Ochtrup | 4,465.62 mi (7,186.72 km) |
| Ballwin to Odenthal | 4,504.90 mi (7,249.93 km) |
| Ballwin to Oelde | 4,513.85 mi (7,264.34 km) |
| Ballwin to Oelsnitz | 4,713.13 mi (7,585.05 km) |
| Ballwin to Oer-Erkenschwick | 4,487.95 mi (7,222.66 km) |
