| Gaithersburg to Boppard | 4,006.77 mi (6,448.28 km) |
| Gaithersburg to Borgentreich | 4,034.33 mi (6,492.63 km) |
| Gaithersburg to Borgholzhausen | 3,982.24 mi (6,408.79 km) |
| Gaithersburg to Borken | 3,933.52 mi (6,330.39 km) |
| Gaithersburg to Borna | 4,174.17 mi (6,717.67 km) |
| Gaithersburg to Bornheim | 3,968.41 mi (6,386.54 km) |
| Gaithersburg to Bosel | 3,944.10 mi (6,347.41 km) |
| Gaithersburg to Bottrop | 3,944.09 mi (6,347.40 km) |
| Gaithersburg to Bovenden | 4,059.86 mi (6,533.71 km) |
| Gaithersburg to Brackenheim | 4,100.21 mi (6,598.66 km) |
| Gaithersburg to Brake | 3,955.40 mi (6,365.61 km) |
| Gaithersburg to Brakel | 4,027.42 mi (6,481.51 km) |
| Gaithersburg to Bramsche | 3,961.68 mi (6,375.70 km) |
| Gaithersburg to Brand | 3,935.00 mi (6,332.78 km) |
| Gaithersburg to Brand-Erbisdorf | 4,213.78 mi (6,781.43 km) |
