| Gaithersburg to Bonhill | 3,403.84 mi (5,477.95 km) |
| Gaithersburg to Bonnyrigg | 3,460.75 mi (5,569.53 km) |
| Gaithersburg to Bootle | 3,507.05 mi (5,644.06 km) |
| Gaithersburg to Borehamwood | 3,652.36 mi (5,877.90 km) |
| Gaithersburg to Boscombe | 3,608.33 mi (5,807.05 km) |
| Gaithersburg to Boston | 3,634.04 mi (5,848.41 km) |
| Gaithersburg to Bottesford | 3,596.47 mi (5,787.97 km) |
| Gaithersburg to Bourne | 3,624.22 mi (5,832.62 km) |
| Gaithersburg to Bournemouth | 3,606.78 mi (5,804.55 km) |
| Gaithersburg to Bournville | 3,568.77 mi (5,743.38 km) |
| Gaithersburg to Bovingdon | 3,640.19 mi (5,858.32 km) |
| Gaithersburg to Bowdon | 3,533.06 mi (5,685.91 km) |
| Gaithersburg to Boxley | 3,693.51 mi (5,944.13 km) |
| Gaithersburg to Brackley | 3,608.82 mi (5,807.84 km) |
| Gaithersburg to Bracknell | 3,638.24 mi (5,855.18 km) |
