| River Ridge to Oberkirch | 5,048.01 mi (8,123.99 km) |
| River Ridge to Obernburg am Main | 5,050.46 mi (8,127.94 km) |
| River Ridge to Obernkirchen | 4,975.15 mi (8,006.73 km) |
| River Ridge to Oberschleissheim | 5,198.77 mi (8,366.62 km) |
| River Ridge to Oberstdorf | 5,173.84 mi (8,326.49 km) |
| River Ridge to Obertraubling | 5,198.95 mi (8,366.90 km) |
| River Ridge to Obertshausen | 5,031.21 mi (8,096.95 km) |
| River Ridge to Oberursel | 5,016.85 mi (8,073.84 km) |
| River Ridge to Ochsenfurt | 5,093.23 mi (8,196.76 km) |
| River Ridge to Ochsenhausen | 5,138.83 mi (8,270.16 km) |
| River Ridge to Ochtrup | 4,903.22 mi (7,890.98 km) |
| River Ridge to Odenthal | 4,934.35 mi (7,941.06 km) |
| River Ridge to Oelde | 4,951.08 mi (7,968.00 km) |
| River Ridge to Oelsnitz | 5,150.68 mi (8,289.22 km) |
| River Ridge to Oer-Erkenschwick | 4,921.87 mi (7,920.98 km) |
