| Marshalltown to Oberkirch | 4,554.78 mi (7,330.21 km) |
| Marshalltown to Obernburg am Main | 4,538.48 mi (7,303.97 km) |
| Marshalltown to Obernkirchen | 4,437.48 mi (7,141.44 km) |
| Marshalltown to Oberschleissheim | 4,692.69 mi (7,552.16 km) |
| Marshalltown to Oberstdorf | 4,682.62 mi (7,535.94 km) |
| Marshalltown to Obertraubling | 4,682.73 mi (7,536.12 km) |
| Marshalltown to Obertshausen | 4,518.11 mi (7,271.20 km) |
| Marshalltown to Oberursel | 4,503.36 mi (7,247.46 km) |
| Marshalltown to Ochsenfurt | 4,579.25 mi (7,369.60 km) |
| Marshalltown to Ochsenhausen | 4,642.11 mi (7,470.76 km) |
| Marshalltown to Ochtrup | 4,373.65 mi (7,038.71 km) |
| Marshalltown to Odenthal | 4,417.86 mi (7,109.85 km) |
| Marshalltown to Oelde | 4,421.81 mi (7,116.22 km) |
| Marshalltown to Oelsnitz | 4,619.65 mi (7,434.61 km) |
| Marshalltown to Oer-Erkenschwick | 4,398.20 mi (7,078.21 km) |
