| Cascades to Oberkirch | 4,087.48 mi (6,578.17 km) |
| Cascades to Obernburg am Main | 4,091.61 mi (6,584.82 km) |
| Cascades to Obernkirchen | 4,020.20 mi (6,469.88 km) |
| Cascades to Oberschleissheim | 4,239.05 mi (6,822.10 km) |
| Cascades to Oberstdorf | 4,213.04 mi (6,780.23 km) |
| Cascades to Obertraubling | 4,240.27 mi (6,824.06 km) |
| Cascades to Obertshausen | 4,072.53 mi (6,554.10 km) |
| Cascades to Oberursel | 4,058.24 mi (6,531.10 km) |
| Cascades to Ochsenfurt | 4,134.51 mi (6,653.86 km) |
| Cascades to Ochsenhausen | 4,178.44 mi (6,724.55 km) |
| Cascades to Ochtrup | 3,947.13 mi (6,352.30 km) |
| Cascades to Odenthal | 3,976.29 mi (6,399.22 km) |
| Cascades to Oelde | 3,994.80 mi (6,429.01 km) |
| Cascades to Oelsnitz | 4,194.10 mi (6,749.75 km) |
| Cascades to Oer-Erkenschwick | 3,964.82 mi (6,380.77 km) |
