| Union to Oberkirch | 4,657.97 mi (7,496.27 km) |
| Union to Obernburg am Main | 4,648.52 mi (7,481.07 km) |
| Union to Obernkirchen | 4,556.73 mi (7,333.35 km) |
| Union to Oberschleissheim | 4,801.15 mi (7,726.70 km) |
| Union to Oberstdorf | 4,785.57 mi (7,701.64 km) |
| Union to Obertraubling | 4,794.89 mi (7,716.63 km) |
| Union to Obertshausen | 4,628.49 mi (7,448.83 km) |
| Union to Oberursel | 4,613.83 mi (7,425.24 km) |
| Union to Ochsenfurt | 4,690.20 mi (7,548.14 km) |
| Union to Ochsenhausen | 4,746.93 mi (7,639.45 km) |
| Union to Ochtrup | 4,489.62 mi (7,225.34 km) |
| Union to Odenthal | 4,529.10 mi (7,288.89 km) |
| Union to Oelde | 4,537.85 mi (7,302.96 km) |
| Union to Oelsnitz | 4,737.09 mi (7,623.61 km) |
| Union to Oer-Erkenschwick | 4,512.05 mi (7,261.44 km) |
