| Gaithersburg to Badger (Alaska) | 3,241.49 mi (5,216.67 km) |
| Gaithersburg to Bailey's Crossroads (Virginia) | 20.31 mi (32.69 km) |
| Gaithersburg to Bainbridge (Georgia) | 704.22 mi (1,133.34 km) |
| Gaithersburg to Bainbridge Island (Washington) | 2,315.30 mi (3,726.12 km) |
| Gaithersburg to Baker (Louisiana) | 985.05 mi (1,585.28 km) |
| Gaithersburg to Bakersfield (California) | 2,294.84 mi (3,693.19 km) |
| Gaithersburg to Balch Springs (Texas) | 1,169.52 mi (1,882.15 km) |
| Gaithersburg to Baldwin (New York) | 217.95 mi (350.75 km) |
| Gaithersburg to Baldwin (Pennsylvania) | 169.32 mi (272.49 km) |
| Gaithersburg to Baldwin Park (California) | 2,268.19 mi (3,650.30 km) |
| Gaithersburg to Ballenger Creek (Maryland) | 20.31 mi (32.68 km) |
| Gaithersburg to Ballwin (Missouri) | 717.82 mi (1,155.22 km) |
| Gaithersburg to Baltimore (Maryland) | 34.14 mi (54.95 km) |
| Gaithersburg to Bangor (Maine) | 584.31 mi (940.36 km) |
| Gaithersburg to Banning (California) | 2,214.19 mi (3,563.39 km) |
