| Middle River to Oberkirch | 4,034.68 mi (6,493.19 km) |
| Middle River to Obernburg am Main | 4,039.34 mi (6,500.69 km) |
| Middle River to Obernkirchen | 3,968.81 mi (6,387.18 km) |
| Middle River to Oberschleissheim | 4,186.52 mi (6,737.55 km) |
| Middle River to Oberstdorf | 4,160.11 mi (6,695.05 km) |
| Middle River to Obertraubling | 4,188.03 mi (6,739.99 km) |
| Middle River to Obertshausen | 4,020.30 mi (6,470.04 km) |
| Middle River to Oberursel | 4,006.03 mi (6,447.08 km) |
| Middle River to Ochsenfurt | 4,082.27 mi (6,569.79 km) |
| Middle River to Ochsenhausen | 4,125.68 mi (6,639.63 km) |
| Middle River to Ochtrup | 3,895.52 mi (6,269.24 km) |
| Middle River to Odenthal | 3,924.23 mi (6,315.44 km) |
| Middle River to Oelde | 3,943.14 mi (6,345.88 km) |
| Middle River to Oelsnitz | 4,142.36 mi (6,666.48 km) |
| Middle River to Oer-Erkenschwick | 3,913.00 mi (6,297.37 km) |
