| Grimbergen to Obernburg am Main | 222.76 mi (358.50 km) |
| Grimbergen to Obernkirchen | 223.04 mi (358.94 km) |
| Grimbergen to Oberschleissheim | 371.09 mi (597.21 km) |
| Grimbergen to Oberstdorf | 360.64 mi (580.39 km) |
| Grimbergen to Obertraubling | 371.57 mi (597.98 km) |
| Grimbergen to Obertshausen | 204.49 mi (329.10 km) |
| Grimbergen to Oberursel | 190.79 mi (307.05 km) |
| Grimbergen to Ochsenfurt | 266.00 mi (428.09 km) |
| Grimbergen to Ochsenhausen | 318.32 mi (512.29 km) |
| Grimbergen to Ochtrup | 149.18 mi (240.08 km) |
| Grimbergen to Odenthal | 119.09 mi (191.66 km) |
| Grimbergen to Oelde | 173.90 mi (279.86 km) |
| Grimbergen to Oelsnitz | 342.50 mi (551.21 km) |
| Grimbergen to Oer-Erkenschwick | 133.23 mi (214.41 km) |
| Grimbergen to Oerlinghausen | 197.74 mi (318.23 km) |
