| South Sioux City to Oberkirch | 4,659.83 mi (7,499.26 km) |
| South Sioux City to Obernburg am Main | 4,639.38 mi (7,466.36 km) |
| South Sioux City to Obernkirchen | 4,532.81 mi (7,294.84 km) |
| South Sioux City to Oberschleissheim | 4,794.23 mi (7,715.57 km) |
| South Sioux City to Oberstdorf | 4,787.52 mi (7,704.76 km) |
| South Sioux City to Obertraubling | 4,781.99 mi (7,695.86 km) |
| South Sioux City to Obertshausen | 4,618.85 mi (7,433.33 km) |
| South Sioux City to Oberursel | 4,604.09 mi (7,409.56 km) |
| South Sioux City to Ochsenfurt | 4,679.51 mi (7,530.95 km) |
| South Sioux City to Ochsenhausen | 4,745.98 mi (7,637.92 km) |
| South Sioux City to Ochtrup | 4,471.23 mi (7,195.75 km) |
| South Sioux City to Odenthal | 4,518.29 mi (7,271.49 km) |
| South Sioux City to Oelde | 4,519.23 mi (7,273.00 km) |
| South Sioux City to Oelsnitz | 4,715.72 mi (7,589.21 km) |
| South Sioux City to Oer-Erkenschwick | 4,497.05 mi (7,237.30 km) |
