| Roman to Oberkirch | 880.54 mi (1,417.10 km) |
| Roman to Obernburg am Main | 838.46 mi (1,349.37 km) |
| Roman to Obernkirchen | 875.72 mi (1,409.34 km) |
| Roman to Oberschleissheim | 720.46 mi (1,159.47 km) |
| Roman to Oberstdorf | 781.32 mi (1,257.41 km) |
| Roman to Obertraubling | 696.36 mi (1,120.69 km) |
| Roman to Obertshausen | 854.06 mi (1,374.47 km) |
| Roman to Oberursel | 866.60 mi (1,394.66 km) |
| Roman to Ochsenfurt | 795.83 mi (1,280.77 km) |
| Roman to Ochsenhausen | 794.96 mi (1,279.37 km) |
| Roman to Ochtrup | 952.87 mi (1,533.49 km) |
| Roman to Odenthal | 938.77 mi (1,510.81 km) |
| Roman to Oelde | 906.90 mi (1,459.51 km) |
| Roman to Oelsnitz | 713.90 mi (1,148.91 km) |
| Roman to Oer-Erkenschwick | 941.23 mi (1,514.77 km) |
