| Alliance to Oberkirch | 4,156.11 mi (6,688.62 km) |
| Alliance to Obernburg am Main | 4,153.47 mi (6,684.36 km) |
| Alliance to Obernkirchen | 4,072.00 mi (6,553.26 km) |
| Alliance to Oberschleissheim | 4,303.80 mi (6,926.30 km) |
| Alliance to Oberstdorf | 4,282.97 mi (6,892.78 km) |
| Alliance to Obertraubling | 4,301.34 mi (6,922.34 km) |
| Alliance to Obertshausen | 4,133.87 mi (6,652.82 km) |
| Alliance to Oberursel | 4,119.37 mi (6,629.48 km) |
| Alliance to Ochsenfurt | 4,195.86 mi (6,752.59 km) |
| Alliance to Ochsenhausen | 4,246.26 mi (6,833.69 km) |
| Alliance to Ochtrup | 4,001.60 mi (6,439.96 km) |
| Alliance to Odenthal | 4,035.86 mi (6,495.09 km) |
| Alliance to Oelde | 4,049.67 mi (6,517.31 km) |
| Alliance to Oelsnitz | 4,249.42 mi (6,838.79 km) |
| Alliance to Oer-Erkenschwick | 4,021.63 mi (6,472.20 km) |
