| Gaithersburg to Blumberg | 4,116.04 mi (6,624.12 km) |
| Gaithersburg to Bobenheim-Roxheim | 4,056.64 mi (6,528.53 km) |
| Gaithersburg to Bobingen | 4,196.86 mi (6,754.20 km) |
| Gaithersburg to Boblingen | 4,110.14 mi (6,614.64 km) |
| Gaithersburg to Bocholt | 3,923.69 mi (6,314.57 km) |
| Gaithersburg to Bochum | 3,956.84 mi (6,367.91 km) |
| Gaithersburg to Bockenem | 4,055.67 mi (6,526.96 km) |
| Gaithersburg to Bockhorn | 3,935.89 mi (6,334.21 km) |
| Gaithersburg to Bogen | 4,251.53 mi (6,842.18 km) |
| Gaithersburg to Bohl-Iggelheim | 4,060.77 mi (6,535.17 km) |
| Gaithersburg to Bohmte | 3,975.49 mi (6,397.94 km) |
| Gaithersburg to Boizenburg | 4,038.73 mi (6,499.70 km) |
| Gaithersburg to Bonen | 3,975.03 mi (6,397.18 km) |
| Gaithersburg to Bonn | 3,972.93 mi (6,393.81 km) |
| Gaithersburg to Bopfingen | 4,159.41 mi (6,693.93 km) |
