| Risca to Oberkirch | 538.45 mi (866.55 km) |
| Risca to Obernburg am Main | 548.10 mi (882.09 km) |
| Risca to Obernkirchen | 521.43 mi (839.16 km) |
| Risca to Oberschleissheim | 690.55 mi (1,111.34 km) |
| Risca to Oberstdorf | 664.97 mi (1,070.17 km) |
| Risca to Obertraubling | 696.44 mi (1,120.81 km) |
| Risca to Obertshausen | 530.45 mi (853.68 km) |
| Risca to Oberursel | 516.96 mi (831.97 km) |
| Risca to Ochsenfurt | 591.45 mi (951.85 km) |
| Risca to Ochsenhausen | 629.17 mi (1,012.55 km) |
| Risca to Ochtrup | 439.82 mi (707.83 km) |
| Risca to Odenthal | 442.20 mi (711.64 km) |
| Risca to Oelde | 480.92 mi (773.97 km) |
| Risca to Oelsnitz | 667.10 mi (1,073.59 km) |
| Risca to Oer-Erkenschwick | 443.23 mi (713.31 km) |
