| Severn to Oberkirch | 4,054.98 mi (6,525.86 km) |
| Severn to Obernburg am Main | 4,059.69 mi (6,533.44 km) |
| Severn to Obernkirchen | 3,989.20 mi (6,420.00 km) |
| Severn to Oberschleissheim | 4,206.85 mi (6,770.27 km) |
| Severn to Oberstdorf | 4,180.40 mi (6,727.70 km) |
| Severn to Obertraubling | 4,208.39 mi (6,772.75 km) |
| Severn to Obertshausen | 4,040.65 mi (6,502.80 km) |
| Severn to Oberursel | 4,026.39 mi (6,479.85 km) |
| Severn to Ochsenfurt | 4,102.63 mi (6,602.54 km) |
| Severn to Ochsenhausen | 4,145.98 mi (6,672.32 km) |
| Severn to Ochtrup | 3,915.91 mi (6,302.05 km) |
| Severn to Odenthal | 3,944.60 mi (6,348.22 km) |
| Severn to Oelde | 3,963.53 mi (6,378.68 km) |
| Severn to Oelsnitz | 4,162.74 mi (6,699.28 km) |
| Severn to Oer-Erkenschwick | 3,933.38 mi (6,330.17 km) |
