| Sighetu Marmatiei to Oberkirch | 727.52 mi (1,170.83 km) |
| Sighetu Marmatiei to Obernburg am Main | 681.91 mi (1,097.43 km) |
| Sighetu Marmatiei to Obernkirchen | 718.45 mi (1,156.23 km) |
| Sighetu Marmatiei to Oberschleissheim | 568.69 mi (915.21 km) |
| Sighetu Marmatiei to Oberstdorf | 633.59 mi (1,019.67 km) |
| Sighetu Marmatiei to Obertraubling | 541.59 mi (871.60 km) |
| Sighetu Marmatiei to Obertshausen | 697.17 mi (1,121.98 km) |
| Sighetu Marmatiei to Oberursel | 709.54 mi (1,141.90 km) |
| Sighetu Marmatiei to Ochsenfurt | 639.54 mi (1,029.23 km) |
| Sighetu Marmatiei to Ochsenhausen | 643.87 mi (1,036.21 km) |
| Sighetu Marmatiei to Ochtrup | 795.24 mi (1,279.81 km) |
| Sighetu Marmatiei to Odenthal | 781.07 mi (1,257.01 km) |
| Sighetu Marmatiei to Oelde | 749.15 mi (1,205.65 km) |
| Sighetu Marmatiei to Oelsnitz | 556.17 mi (895.07 km) |
| Sighetu Marmatiei to Oer-Erkenschwick | 783.40 mi (1,260.76 km) |
