| Rock Island to Oberkirch | 4,496.07 mi (7,235.72 km) |
| Rock Island to Obernburg am Main | 4,482.92 mi (7,214.56 km) |
| Rock Island to Obernkirchen | 4,386.25 mi (7,058.98 km) |
| Rock Island to Oberschleissheim | 4,636.48 mi (7,461.69 km) |
| Rock Island to Oberstdorf | 4,623.87 mi (7,441.41 km) |
| Rock Island to Obertraubling | 4,628.24 mi (7,448.43 km) |
| Rock Island to Obertshausen | 4,462.70 mi (7,182.02 km) |
| Rock Island to Oberursel | 4,447.98 mi (7,158.33 km) |
| Rock Island to Ochsenfurt | 4,524.14 mi (7,280.90 km) |
| Rock Island to Ochsenhausen | 4,584.20 mi (7,377.55 km) |
| Rock Island to Ochtrup | 4,320.80 mi (6,953.65 km) |
| Rock Island to Odenthal | 4,362.79 mi (7,021.24 km) |
| Rock Island to Oelde | 4,369.02 mi (7,031.26 km) |
| Rock Island to Oelsnitz | 4,567.64 mi (7,350.91 km) |
| Rock Island to Oer-Erkenschwick | 4,344.35 mi (6,991.56 km) |
