| Grimbergen to Orzesze | 632.15 mi (1,017.34 km) |
| Grimbergen to Osowa | 636.18 mi (1,023.84 km) |
| Grimbergen to Ostroda | 683.79 mi (1,100.46 km) |
| Grimbergen to Ostroleka | 743.75 mi (1,196.94 km) |
| Grimbergen to Ostrow Mazowiecka | 756.42 mi (1,217.34 km) |
| Grimbergen to Ostrow Wielkopolski | 581.70 mi (936.15 km) |
| Grimbergen to Ostrowiec Swietokrzyski | 739.33 mi (1,189.84 km) |
| Grimbergen to Ostrzeszow | 587.06 mi (944.79 km) |
| Grimbergen to Oswiecim | 654.12 mi (1,052.71 km) |
| Grimbergen to Otwock | 728.70 mi (1,172.73 km) |
| Grimbergen to Ozarow Mazowiecki | 708.94 mi (1,140.94 km) |
| Grimbergen to Ozimek | 603.28 mi (970.88 km) |
| Grimbergen to Ozorkow | 644.39 mi (1,037.04 km) |
| Grimbergen to Pabianice | 648.86 mi (1,044.24 km) |
| Grimbergen to Parczew | 798.10 mi (1,284.41 km) |
