| Rickmansworth to Oberkirch | 435.12 mi (700.26 km) |
| Rickmansworth to Obernburg am Main | 437.70 mi (704.41 km) |
| Rickmansworth to Obernkirchen | 410.10 mi (659.99 km) |
| Rickmansworth to Oberschleissheim | 583.09 mi (938.39 km) |
| Rickmansworth to Oberstdorf | 562.74 mi (905.65 km) |
| Rickmansworth to Obertraubling | 586.41 mi (943.74 km) |
| Rickmansworth to Obertshausen | 419.59 mi (675.26 km) |
| Rickmansworth to Oberursel | 405.86 mi (653.17 km) |
| Rickmansworth to Ochsenfurt | 481.00 mi (774.10 km) |
| Rickmansworth to Ochsenhausen | 524.60 mi (844.26 km) |
| Rickmansworth to Ochtrup | 328.44 mi (528.57 km) |
| Rickmansworth to Odenthal | 329.82 mi (530.79 km) |
| Rickmansworth to Oelde | 368.69 mi (593.36 km) |
| Rickmansworth to Oelsnitz | 554.69 mi (892.69 km) |
| Rickmansworth to Oer-Erkenschwick | 330.73 mi (532.26 km) |
