| River Falls to Oberkirch | 4,408.77 mi (7,095.24 km) |
| River Falls to Obernburg am Main | 4,388.86 mi (7,063.19 km) |
| River Falls to Obernkirchen | 4,283.28 mi (6,893.27 km) |
| River Falls to Oberschleissheim | 4,543.64 mi (7,312.28 km) |
| River Falls to Oberstdorf | 4,536.49 mi (7,300.78 km) |
| River Falls to Obertraubling | 4,531.75 mi (7,293.15 km) |
| River Falls to Obertshausen | 4,368.36 mi (7,030.19 km) |
| River Falls to Oberursel | 4,353.60 mi (7,006.44 km) |
| River Falls to Ochsenfurt | 4,429.10 mi (7,127.95 km) |
| River Falls to Ochsenhausen | 4,495.07 mi (7,234.12 km) |
| River Falls to Ochtrup | 4,221.25 mi (6,793.45 km) |
| River Falls to Odenthal | 4,267.84 mi (6,868.42 km) |
| River Falls to Oelde | 4,269.29 mi (6,870.76 km) |
| River Falls to Oelsnitz | 4,466.07 mi (7,187.44 km) |
| River Falls to Oer-Erkenschwick | 4,246.85 mi (6,834.65 km) |
