| Houma to Oberkirch | 5,087.05 mi (8,186.82 km) |
| Houma to Obernburg am Main | 5,089.40 mi (8,190.60 km) |
| Houma to Obernkirchen | 5,013.88 mi (8,069.06 km) |
| Houma to Oberschleissheim | 5,237.76 mi (8,429.36 km) |
| Houma to Oberstdorf | 5,212.90 mi (8,389.35 km) |
| Houma to Obertraubling | 5,237.87 mi (8,429.54 km) |
| Houma to Obertshausen | 5,070.14 mi (8,159.60 km) |
| Houma to Oberursel | 5,055.77 mi (8,136.48 km) |
| Houma to Ochsenfurt | 5,132.16 mi (8,259.41 km) |
| Houma to Ochsenhausen | 5,177.87 mi (8,332.97 km) |
| Houma to Ochtrup | 4,942.01 mi (7,953.40 km) |
| Houma to Odenthal | 4,973.24 mi (8,003.66 km) |
| Houma to Oelde | 4,989.88 mi (8,030.44 km) |
| Houma to Oelsnitz | 5,189.49 mi (8,351.68 km) |
| Houma to Oer-Erkenschwick | 4,960.71 mi (7,983.49 km) |
