| Two Rivers to Oberkirch | 4,258.49 mi (6,853.37 km) |
| Two Rivers to Obernburg am Main | 4,244.47 mi (6,830.82 km) |
| Two Rivers to Obernkirchen | 4,146.95 mi (6,673.87 km) |
| Two Rivers to Oberschleissheim | 4,398.21 mi (7,078.24 km) |
| Two Rivers to Oberstdorf | 4,386.31 mi (7,059.09 km) |
| Two Rivers to Obertraubling | 4,389.56 mi (7,064.32 km) |
| Two Rivers to Obertshausen | 4,224.22 mi (6,798.22 km) |
| Two Rivers to Oberursel | 4,209.49 mi (6,774.52 km) |
| Two Rivers to Ochsenfurt | 4,285.59 mi (6,897.00 km) |
| Two Rivers to Ochsenhausen | 4,346.39 mi (6,994.83 km) |
| Two Rivers to Ochtrup | 4,081.77 mi (6,568.97 km) |
| Two Rivers to Odenthal | 4,124.22 mi (6,637.29 km) |
| Two Rivers to Oelde | 4,129.98 mi (6,646.56 km) |
| Two Rivers to Oelsnitz | 4,328.48 mi (6,966.01 km) |
| Two Rivers to Oer-Erkenschwick | 4,105.51 mi (6,607.19 km) |
