| South Houston to Oberkirch | 5,265.72 mi (8,474.35 km) |
| South Houston to Obernburg am Main | 5,262.53 mi (8,469.23 km) |
| South Houston to Obernkirchen | 5,178.78 mi (8,334.44 km) |
| South Houston to Oberschleissheim | 5,413.17 mi (8,711.65 km) |
| South Houston to Oberstdorf | 5,392.58 mi (8,678.52 km) |
| South Houston to Obertraubling | 5,410.22 mi (8,706.91 km) |
| South Houston to Obertshausen | 5,242.87 mi (8,437.58 km) |
| South Houston to Oberursel | 5,228.33 mi (8,414.19 km) |
| South Houston to Ochsenfurt | 5,304.84 mi (8,537.31 km) |
| South Houston to Ochsenhausen | 5,355.83 mi (8,619.38 km) |
| South Houston to Ochtrup | 5,109.23 mi (8,222.51 km) |
| South Houston to Odenthal | 5,144.60 mi (8,279.44 km) |
| South Houston to Oelde | 5,157.36 mi (8,299.97 km) |
| South Houston to Oelsnitz | 5,357.09 mi (8,621.40 km) |
| South Houston to Oer-Erkenschwick | 5,129.83 mi (8,255.66 km) |
