| Rheinberg to Oberkirch | 218.34 mi (351.39 km) |
| Rheinberg to Obernburg am Main | 162.07 mi (260.82 km) |
| Rheinberg to Obernkirchen | 118.25 mi (190.31 km) |
| Rheinberg to Oberschleissheim | 317.25 mi (510.56 km) |
| Rheinberg to Oberstdorf | 330.01 mi (531.11 km) |
| Rheinberg to Obertraubling | 303.61 mi (488.61 km) |
| Rheinberg to Obertshausen | 141.27 mi (227.35 km) |
| Rheinberg to Oberursel | 126.64 mi (203.81 km) |
| Rheinberg to Ochsenfurt | 200.66 mi (322.94 km) |
| Rheinberg to Ochsenhausen | 282.61 mi (454.82 km) |
| Rheinberg to Ochtrup | 52.01 mi (83.71 km) |
| Rheinberg to Odenthal | 41.90 mi (67.43 km) |
| Rheinberg to Oelde | 69.25 mi (111.45 km) |
| Rheinberg to Oelsnitz | 254.32 mi (409.29 km) |
| Rheinberg to Oer-Erkenschwick | 28.68 mi (46.15 km) |
