| Boulder to Beyne-Heusay | 4,913.33 mi (7,907.24 km) |
| Boulder to Bierbeek | 4,874.25 mi (7,844.35 km) |
| Boulder to Bilzen | 4,897.63 mi (7,881.98 km) |
| Boulder to Binche | 4,873.44 mi (7,843.04 km) |
| Boulder to Bissegem | 4,823.00 mi (7,761.86 km) |
| Boulder to Blankenberge | 4,798.53 mi (7,722.48 km) |
| Boulder to Blegny | 4,913.83 mi (7,908.04 km) |
| Boulder to Bocholt | 4,885.93 mi (7,863.14 km) |
| Boulder to Boechout | 4,850.72 mi (7,806.49 km) |
| Boulder to Bonheiden | 4,857.57 mi (7,817.51 km) |
| Boulder to Boom | 4,849.81 mi (7,805.01 km) |
| Boulder to Boortmeerbeek | 4,860.91 mi (7,822.87 km) |
| Boulder to Borgerhout | 4,846.57 mi (7,799.80 km) |
| Boulder to Borgloon | 4,894.80 mi (7,877.42 km) |
| Boulder to Bornem | 4,844.63 mi (7,796.68 km) |
