| Geraardsbergen to Obernburg am Main | 241.37 mi (388.44 km) |
| Geraardsbergen to Obernkirchen | 248.34 mi (399.67 km) |
| Geraardsbergen to Oberschleissheim | 386.49 mi (622.00 km) |
| Geraardsbergen to Oberstdorf | 371.24 mi (597.46 km) |
| Geraardsbergen to Obertraubling | 389.78 mi (627.29 km) |
| Geraardsbergen to Obertshausen | 223.90 mi (360.33 km) |
| Geraardsbergen to Oberursel | 210.66 mi (339.03 km) |
| Geraardsbergen to Ochsenfurt | 284.71 mi (458.20 km) |
| Geraardsbergen to Ochsenhausen | 330.55 mi (531.97 km) |
| Geraardsbergen to Ochtrup | 174.13 mi (280.24 km) |
| Geraardsbergen to Odenthal | 142.80 mi (229.82 km) |
| Geraardsbergen to Oelde | 199.14 mi (320.48 km) |
| Geraardsbergen to Oelsnitz | 364.68 mi (586.89 km) |
| Geraardsbergen to Oer-Erkenschwick | 158.48 mi (255.04 km) |
| Geraardsbergen to Oerlinghausen | 222.99 mi (358.86 km) |
