| Grimbergen to Novi di Modena | 514.60 mi (828.16 km) |
| Grimbergen to Novi Ligure | 472.70 mi (760.74 km) |
| Grimbergen to Nuoro | 771.10 mi (1,240.96 km) |
| Grimbergen to Occhiobello | 532.00 mi (856.17 km) |
| Grimbergen to Oderzo | 514.57 mi (828.12 km) |
| Grimbergen to Oggiono | 422.40 mi (679.79 km) |
| Grimbergen to Olbia | 734.02 mi (1,181.29 km) |
| Grimbergen to Oleggio | 416.96 mi (671.03 km) |
| Grimbergen to Olgiate Comasco | 413.20 mi (664.99 km) |
| Grimbergen to Olgiate Olona | 420.41 mi (676.59 km) |
| Grimbergen to Omegna | 394.90 mi (635.52 km) |
| Grimbergen to Opera | 443.26 mi (713.35 km) |
| Grimbergen to Oppeano | 499.44 mi (803.78 km) |
| Grimbergen to Orbassano | 434.55 mi (699.35 km) |
| Grimbergen to Orbetello | 669.54 mi (1,077.52 km) |
