| Humanes de Madrid to Oberkirch | 818.60 mi (1,317.41 km) |
| Humanes de Madrid to Obernburg am Main | 913.73 mi (1,470.51 km) |
| Humanes de Madrid to Obernkirchen | 1,031.72 mi (1,660.40 km) |
| Humanes de Madrid to Oberschleissheim | 938.27 mi (1,510.00 km) |
| Humanes de Madrid to Oberstdorf | 857.44 mi (1,379.92 km) |
| Humanes de Madrid to Obertraubling | 987.23 mi (1,588.80 km) |
| Humanes de Madrid to Obertshausen | 914.13 mi (1,471.16 km) |
| Humanes de Madrid to Oberursel | 912.42 mi (1,468.39 km) |
| Humanes de Madrid to Ochsenfurt | 936.91 mi (1,507.81 km) |
| Humanes de Madrid to Ochsenhausen | 868.42 mi (1,397.59 km) |
| Humanes de Madrid to Ochtrup | 976.99 mi (1,572.31 km) |
| Humanes de Madrid to Odenthal | 911.23 mi (1,466.48 km) |
| Humanes de Madrid to Oelde | 982.19 mi (1,580.68 km) |
| Humanes de Madrid to Oelsnitz | 1,043.13 mi (1,678.75 km) |
| Humanes de Madrid to Oer-Erkenschwick | 947.64 mi (1,525.08 km) |
