| Gaithersburg to Bound Brook (New Jersey) | 173.00 mi (278.42 km) |
| Gaithersburg to Bountiful (Utah) | 1,825.92 mi (2,938.53 km) |
| Gaithersburg to Bourbonnais (Illinois) | 580.28 mi (933.86 km) |
| Gaithersburg to Bowie (Maryland) | 28.23 mi (45.43 km) |
| Gaithersburg to Bowling Green (Kentucky) | 523.39 mi (842.31 km) |
| Gaithersburg to Bowling Green (Ohio) | 372.97 mi (600.23 km) |
| Gaithersburg to Box Elder (South Dakota) | 1,373.37 mi (2,210.23 km) |
| Gaithersburg to Boynton Beach (Florida) | 886.65 mi (1,426.93 km) |
| Gaithersburg to Bozeman (Montana) | 1,770.36 mi (2,849.11 km) |
| Gaithersburg to Bradenton (Florida) | 861.63 mi (1,386.66 km) |
| Gaithersburg to Bradfordville (Florida) | 711.54 mi (1,145.11 km) |
| Gaithersburg to Bradley (Illinois) | 578.34 mi (930.75 km) |
| Gaithersburg to Bradley Gardens (New Jersey) | 167.55 mi (269.65 km) |
| Gaithersburg to Brainerd (Minnesota) | 992.80 mi (1,597.76 km) |
| Gaithersburg to Brambleton (Virginia) | 20.17 mi (32.47 km) |
