| Gaithersburg to Bridgeport (Connecticut) | 255.31 mi (410.89 km) |
| Gaithersburg to Bridgeton (Missouri) | 709.87 mi (1,142.43 km) |
| Gaithersburg to Bridgetown (Ohio) | 397.65 mi (639.95 km) |
| Gaithersburg to Bridgeview (Illinois) | 585.00 mi (941.47 km) |
| Gaithersburg to Brigham City (Utah) | 1,829.83 mi (2,944.83 km) |
| Gaithersburg to Brighton (Colorado) | 1,464.72 mi (2,357.25 km) |
| Gaithersburg to Bristol (Connecticut) | 285.39 mi (459.29 km) |
| Gaithersburg to Bristol (Tennessee) | 325.81 mi (524.33 km) |
| Gaithersburg to Bristol (Virginia) | 320.91 mi (516.45 km) |
| Gaithersburg to Broadlands (Virginia) | 18.21 mi (29.30 km) |
| Gaithersburg to Broadview Heights (Ohio) | 279.70 mi (450.13 km) |
| Gaithersburg to Brock Hall (Maryland) | 31.44 mi (50.59 km) |
| Gaithersburg to Brockton (Massachusetts) | 383.07 mi (616.49 km) |
| Gaithersburg to Broken Arrow (Oklahoma) | 1,036.91 mi (1,668.75 km) |
| Gaithersburg to Bronx (New York) | 213.13 mi (343.01 km) |
