| Castlebar to Borsbeek | 606.62 mi (976.26 km) |
| Castlebar to Boussu | 602.46 mi (969.56 km) |
| Castlebar to Braine-l'Alleud | 617.13 mi (993.18 km) |
| Castlebar to Braine-le-Chateau | 612.92 mi (986.41 km) |
| Castlebar to Braine-le-Comte | 610.27 mi (982.13 km) |
| Castlebar to Brasschaat | 604.38 mi (972.66 km) |
| Castlebar to Brecht | 608.65 mi (979.52 km) |
| Castlebar to Bredene | 545.89 mi (878.52 km) |
| Castlebar to Bree | 652.35 mi (1,049.85 km) |
| Castlebar to Bruges | 556.40 mi (895.44 km) |
| Castlebar to Brussels | 611.40 mi (983.96 km) |
| Castlebar to Buggenhout | 600.93 mi (967.10 km) |
| Castlebar to Chapelle-lez-Herlaimont | 620.33 mi (998.33 km) |
| Castlebar to Charleroi | 628.32 mi (1,011.18 km) |
| Castlebar to Chatelet | 631.57 mi (1,016.41 km) |
