| Grimbergen to Ostend | 66.68 mi (107.31 km) |
| Grimbergen to Oud-Heverlee | 14.15 mi (22.78 km) |
| Grimbergen to Oud-Turnhout | 37.13 mi (59.76 km) |
| Grimbergen to Oudenaarde | 34.62 mi (55.72 km) |
| Grimbergen to Oudenburg | 62.51 mi (100.59 km) |
| Grimbergen to Oupeye | 57.14 mi (91.96 km) |
| Grimbergen to Overijse | 12.26 mi (19.72 km) |
| Grimbergen to Overpelt | 48.95 mi (78.77 km) |
| Grimbergen to Paal | 35.11 mi (56.50 km) |
| Grimbergen to Peer | 48.50 mi (78.06 km) |
| Grimbergen to Pepinster | 67.59 mi (108.77 km) |
| Grimbergen to Peruwelz | 45.31 mi (72.92 km) |
| Grimbergen to Perwez | 28.50 mi (45.86 km) |
| Grimbergen to Philippeville | 51.19 mi (82.38 km) |
| Grimbergen to Plombieres | 69.75 mi (112.25 km) |
