| Grimbergen to Oegstgeest | 86.44 mi (139.11 km) |
| Grimbergen to Oirschot | 55.74 mi (89.71 km) |
| Grimbergen to Oisterwijk | 57.13 mi (91.94 km) |
| Grimbergen to Oldebroek | 123.29 mi (198.41 km) |
| Grimbergen to Oldenzaal | 145.24 mi (233.74 km) |
| Grimbergen to Ommen | 139.78 mi (224.96 km) |
| Grimbergen to Oosterend | 159.97 mi (257.45 km) |
| Grimbergen to Oosterhout | 53.14 mi (85.52 km) |
| Grimbergen to Oosterwolde | 163.69 mi (263.43 km) |
| Grimbergen to Oostzaan | 105.83 mi (170.32 km) |
| Grimbergen to Opmeer | 124.44 mi (200.27 km) |
| Grimbergen to Oss | 75.55 mi (121.58 km) |
| Grimbergen to Oud-Beijerland | 61.04 mi (98.24 km) |
| Grimbergen to Oudenbosch | 45.72 mi (73.59 km) |
| Grimbergen to Oudewater | 77.69 mi (125.03 km) |
