| Geraardsbergen to Oestrich-Winkel | 189.62 mi (305.17 km) |
| Geraardsbergen to Offenburg | 241.58 mi (388.79 km) |
| Geraardsbergen to Oftersheim | 230.35 mi (370.71 km) |
| Geraardsbergen to Ohrdruf | 299.77 mi (482.44 km) |
| Geraardsbergen to Ohringen | 272.59 mi (438.69 km) |
| Geraardsbergen to Olbernhau | 413.91 mi (666.12 km) |
| Geraardsbergen to Olching | 378.28 mi (608.78 km) |
| Geraardsbergen to Oldenburg | 247.39 mi (398.14 km) |
| Geraardsbergen to Oldenburg in Holstein | 382.53 mi (615.62 km) |
| Geraardsbergen to Olfen | 165.65 mi (266.58 km) |
| Geraardsbergen to Olpe | 173.72 mi (279.57 km) |
| Geraardsbergen to Olsberg | 204.46 mi (329.05 km) |
| Geraardsbergen to Oranienburg | 423.23 mi (681.12 km) |
| Geraardsbergen to Ortenberg | 229.45 mi (369.27 km) |
| Geraardsbergen to Oschatz | 402.92 mi (648.44 km) |
