| Cedar Rapids to Oberkirch | 4,512.96 mi (7,262.91 km) |
| Cedar Rapids to Obernburg am Main | 4,498.00 mi (7,238.84 km) |
| Cedar Rapids to Obernkirchen | 4,398.87 mi (7,079.29 km) |
| Cedar Rapids to Oberschleissheim | 4,651.96 mi (7,486.60 km) |
| Cedar Rapids to Oberstdorf | 4,640.80 mi (7,468.64 km) |
| Cedar Rapids to Obertraubling | 4,642.73 mi (7,471.75 km) |
| Cedar Rapids to Obertshausen | 4,477.70 mi (7,206.15 km) |
| Cedar Rapids to Oberursel | 4,462.96 mi (7,182.44 km) |
| Cedar Rapids to Ochsenfurt | 4,538.98 mi (7,304.78 km) |
| Cedar Rapids to Ochsenhausen | 4,600.64 mi (7,404.02 km) |
| Cedar Rapids to Ochtrup | 4,334.32 mi (6,975.42 km) |
| Cedar Rapids to Odenthal | 4,377.58 mi (7,045.04 km) |
| Cedar Rapids to Oelde | 4,382.52 mi (7,052.98 km) |
| Cedar Rapids to Oelsnitz | 4,580.72 mi (7,371.96 km) |
| Cedar Rapids to Oer-Erkenschwick | 4,358.44 mi (7,014.24 km) |
