| Guadarrama to Oberkirch | 806.63 mi (1,298.14 km) |
| Guadarrama to Obernburg am Main | 900.41 mi (1,449.07 km) |
| Guadarrama to Obernkirchen | 1,014.83 mi (1,633.21 km) |
| Guadarrama to Oberschleissheim | 930.01 mi (1,496.70 km) |
| Guadarrama to Oberstdorf | 849.94 mi (1,367.84 km) |
| Guadarrama to Obertraubling | 978.03 mi (1,573.98 km) |
| Guadarrama to Obertshausen | 900.15 mi (1,448.65 km) |
| Guadarrama to Oberursel | 897.96 mi (1,445.13 km) |
| Guadarrama to Ochsenfurt | 924.76 mi (1,488.26 km) |
| Guadarrama to Ochsenhausen | 859.20 mi (1,382.75 km) |
| Guadarrama to Ochtrup | 958.47 mi (1,542.51 km) |
| Guadarrama to Odenthal | 894.10 mi (1,438.92 km) |
| Guadarrama to Oelde | 965.00 mi (1,553.01 km) |
| Guadarrama to Oelsnitz | 1,031.37 mi (1,659.83 km) |
| Guadarrama to Oer-Erkenschwick | 929.86 mi (1,496.46 km) |
