| Gaithersburg to Beltsville (Maryland) | 16.99 mi (27.33 km) |
| Gaithersburg to Belvedere Park (Georgia) | 539.92 mi (868.92 km) |
| Gaithersburg to Belvidere (Illinois) | 646.68 mi (1,040.74 km) |
| Gaithersburg to Bemidji (Minnesota) | 1,055.26 mi (1,698.28 km) |
| Gaithersburg to Benbrook (Texas) | 1,214.58 mi (1,954.67 km) |
| Gaithersburg to Bend (Oregon) | 2,276.15 mi (3,663.11 km) |
| Gaithersburg to Benicia (California) | 2,402.46 mi (3,866.39 km) |
| Gaithersburg to Bensenville (Illinois) | 595.72 mi (958.73 km) |
| Gaithersburg to Bensville (Maryland) | 37.39 mi (60.17 km) |
| Gaithersburg to Benton (Arkansas) | 904.15 mi (1,455.08 km) |
| Gaithersburg to Bentonville (Arkansas) | 947.87 mi (1,525.45 km) |
| Gaithersburg to Berea (Kentucky) | 397.83 mi (640.25 km) |
| Gaithersburg to Berea (Ohio) | 289.76 mi (466.32 km) |
| Gaithersburg to Berea (South Carolina) | 412.61 mi (664.04 km) |
| Gaithersburg to Bergenfield (New Jersey) | 210.23 mi (338.34 km) |
