| Gaithersburg to Beyne-Heusay | 3,917.84 mi (6,305.16 km) |
| Gaithersburg to Bierbeek | 3,876.42 mi (6,238.50 km) |
| Gaithersburg to Bilzen | 3,905.77 mi (6,285.72 km) |
| Gaithersburg to Binche | 3,863.40 mi (6,217.54 km) |
| Gaithersburg to Bissegem | 3,814.04 mi (6,138.11 km) |
| Gaithersburg to Blankenberge | 3,797.94 mi (6,112.20 km) |
| Gaithersburg to Blegny | 3,919.85 mi (6,308.40 km) |
| Gaithersburg to Bocholt | 3,900.15 mi (6,276.69 km) |
| Gaithersburg to Boechout | 3,856.77 mi (6,206.88 km) |
| Gaithersburg to Bonheiden | 3,861.80 mi (6,214.97 km) |
| Gaithersburg to Boom | 3,853.80 mi (6,202.09 km) |
| Gaithersburg to Boortmeerbeek | 3,864.44 mi (6,219.22 km) |
| Gaithersburg to Borgerhout | 3,853.47 mi (6,201.56 km) |
| Gaithersburg to Borgloon | 3,900.50 mi (6,277.25 km) |
| Gaithersburg to Bornem | 3,848.00 mi (6,192.75 km) |
