| Boortmeerbeek to Obernburg am Main | 216.32 mi (348.13 km) |
| Boortmeerbeek to Obernkirchen | 214.35 mi (344.96 km) |
| Boortmeerbeek to Oberschleissheim | 365.64 mi (588.44 km) |
| Boortmeerbeek to Oberstdorf | 356.86 mi (574.31 km) |
| Boortmeerbeek to Obertraubling | 365.14 mi (587.64 km) |
| Boortmeerbeek to Obertshausen | 197.79 mi (318.31 km) |
| Boortmeerbeek to Oberursel | 183.94 mi (296.02 km) |
| Boortmeerbeek to Ochsenfurt | 259.47 mi (417.58 km) |
| Boortmeerbeek to Ochsenhausen | 314.03 mi (505.38 km) |
| Boortmeerbeek to Ochtrup | 140.75 mi (226.51 km) |
| Boortmeerbeek to Odenthal | 110.91 mi (178.49 km) |
| Boortmeerbeek to Oelde | 165.20 mi (265.87 km) |
| Boortmeerbeek to Oelsnitz | 334.74 mi (538.71 km) |
| Boortmeerbeek to Oer-Erkenschwick | 124.53 mi (200.41 km) |
| Boortmeerbeek to Oerlinghausen | 189.04 mi (304.23 km) |
