| Gaithersburg to Baraboo (Wisconsin) | 714.79 mi (1,150.34 km) |
| Gaithersburg to Barberton (Ohio) | 265.79 mi (427.75 km) |
| Gaithersburg to Bardstown (Kentucky) | 454.83 mi (731.98 km) |
| Gaithersburg to Barrington (Illinois) | 608.48 mi (979.25 km) |
| Gaithersburg to Barstow (California) | 2,200.01 mi (3,540.57 km) |
| Gaithersburg to Bartlesville (Oklahoma) | 1,032.26 mi (1,661.25 km) |
| Gaithersburg to Bartlett (Illinois) | 609.16 mi (980.35 km) |
| Gaithersburg to Bartlett (Tennessee) | 743.62 mi (1,196.74 km) |
| Gaithersburg to Bartow (Florida) | 820.91 mi (1,321.13 km) |
| Gaithersburg to Batavia (Illinois) | 612.00 mi (984.93 km) |
| Gaithersburg to Batavia (New York) | 271.69 mi (437.24 km) |
| Gaithersburg to Batesville (Arkansas) | 822.84 mi (1,324.23 km) |
| Gaithersburg to Baton Rouge (Louisiana) | 990.21 mi (1,593.58 km) |
| Gaithersburg to Battle Creek (Michigan) | 473.04 mi (761.28 km) |
| Gaithersburg to Battle Ground (Washington) | 2,323.57 mi (3,739.42 km) |
