| Boulder to Borsbeek | 4,848.50 mi (7,802.91 km) |
| Boulder to Boussu | 4,859.45 mi (7,820.53 km) |
| Boulder to Braine-l'Alleud | 4,867.86 mi (7,834.07 km) |
| Boulder to Braine-le-Chateau | 4,864.22 mi (7,828.21 km) |
| Boulder to Braine-le-Comte | 4,863.44 mi (7,826.95 km) |
| Boulder to Brasschaat | 4,844.57 mi (7,796.59 km) |
| Boulder to Brecht | 4,846.81 mi (7,800.18 km) |
| Boulder to Bredene | 4,796.68 mi (7,719.51 km) |
| Boulder to Bree | 4,887.81 mi (7,866.17 km) |
| Boulder to Bruges | 4,806.11 mi (7,734.68 km) |
| Boulder to Brussels | 4,859.84 mi (7,821.15 km) |
| Boulder to Buggenhout | 4,847.95 mi (7,802.01 km) |
| Boulder to Chapelle-lez-Herlaimont | 4,874.40 mi (7,844.59 km) |
| Boulder to Charleroi | 4,882.42 mi (7,857.50 km) |
| Boulder to Chatelet | 4,885.23 mi (7,862.01 km) |
