| Champaign to Oberkirch | 4,473.05 mi (7,198.68 km) |
| Champaign to Obernburg am Main | 4,464.19 mi (7,184.42 km) |
| Champaign to Obernkirchen | 4,373.45 mi (7,038.39 km) |
| Champaign to Oberschleissheim | 4,616.63 mi (7,429.75 km) |
| Champaign to Oberstdorf | 4,600.62 mi (7,403.98 km) |
| Champaign to Obertraubling | 4,610.73 mi (7,420.25 km) |
| Champaign to Obertshausen | 4,444.19 mi (7,152.24 km) |
| Champaign to Oberursel | 4,429.54 mi (7,128.66 km) |
| Champaign to Ochsenfurt | 4,505.94 mi (7,251.61 km) |
| Champaign to Ochsenhausen | 4,562.12 mi (7,342.02 km) |
| Champaign to Ochtrup | 4,305.96 mi (6,929.77 km) |
| Champaign to Odenthal | 4,344.92 mi (6,992.47 km) |
| Champaign to Oelde | 4,354.18 mi (7,007.38 km) |
| Champaign to Oelsnitz | 4,553.53 mi (7,328.20 km) |
| Champaign to Oer-Erkenschwick | 4,328.14 mi (6,965.47 km) |
