| Madrid to Oberkirch | 805.84 mi (1,296.87 km) |
| Madrid to Obernburg am Main | 900.86 mi (1,449.80 km) |
| Madrid to Obernkirchen | 1,018.70 mi (1,639.44 km) |
| Madrid to Oberschleissheim | 925.93 mi (1,490.15 km) |
| Madrid to Oberstdorf | 845.21 mi (1,360.23 km) |
| Madrid to Obertraubling | 974.77 mi (1,568.75 km) |
| Madrid to Obertshausen | 901.22 mi (1,450.38 km) |
| Madrid to Oberursel | 899.48 mi (1,447.57 km) |
| Madrid to Ochsenfurt | 924.13 mi (1,487.25 km) |
| Madrid to Ochsenhausen | 855.96 mi (1,377.53 km) |
| Madrid to Ochtrup | 963.96 mi (1,551.34 km) |
| Madrid to Odenthal | 898.20 mi (1,445.52 km) |
| Madrid to Oelde | 969.16 mi (1,559.71 km) |
| Madrid to Oelsnitz | 1,030.39 mi (1,658.26 km) |
| Madrid to Oer-Erkenschwick | 934.61 mi (1,504.11 km) |
