| Ramnicu Valcea to Oberkirch | 804.11 mi (1,294.09 km) |
| Ramnicu Valcea to Obernburg am Main | 781.23 mi (1,257.27 km) |
| Ramnicu Valcea to Obernkirchen | 851.20 mi (1,369.88 km) |
| Ramnicu Valcea to Oberschleissheim | 643.98 mi (1,036.39 km) |
| Ramnicu Valcea to Oberstdorf | 690.94 mi (1,111.97 km) |
| Ramnicu Valcea to Obertraubling | 632.82 mi (1,018.43 km) |
| Ramnicu Valcea to Obertshausen | 799.31 mi (1,286.37 km) |
| Ramnicu Valcea to Oberursel | 813.17 mi (1,308.67 km) |
| Ramnicu Valcea to Ochsenfurt | 737.90 mi (1,187.54 km) |
| Ramnicu Valcea to Ochsenhausen | 713.85 mi (1,148.83 km) |
| Ramnicu Valcea to Ochtrup | 921.69 mi (1,483.32 km) |
| Ramnicu Valcea to Odenthal | 892.99 mi (1,437.13 km) |
| Ramnicu Valcea to Oelde | 873.78 mi (1,406.22 km) |
| Ramnicu Valcea to Oelsnitz | 674.19 mi (1,085.00 km) |
| Ramnicu Valcea to Oer-Erkenschwick | 903.32 mi (1,453.76 km) |
