| Gaithersburg to Bixby (Oklahoma) | 1,044.02 mi (1,680.18 km) |
| Gaithersburg to Black Forest (Colorado) | 1,466.89 mi (2,360.72 km) |
| Gaithersburg to Blackfoot (Idaho) | 1,835.06 mi (2,953.25 km) |
| Gaithersburg to Blackhawk (California) | 2,394.58 mi (3,853.71 km) |
| Gaithersburg to Blacksburg (Virginia) | 218.61 mi (351.82 km) |
| Gaithersburg to Blackwells Mills (New Jersey) | 166.96 mi (268.70 km) |
| Gaithersburg to Blaine (Minnesota) | 917.06 mi (1,475.87 km) |
| Gaithersburg to Bloomingdale (Florida) | 829.96 mi (1,335.69 km) |
| Gaithersburg to Bloomingdale (Illinois) | 602.77 mi (970.07 km) |
| Gaithersburg to Bloomington (California) | 2,238.23 mi (3,602.08 km) |
| Gaithersburg to Bloomington (Illinois) | 630.42 mi (1,014.56 km) |
| Gaithersburg to Bloomington (Indiana) | 498.77 mi (802.70 km) |
| Gaithersburg to Bloomington (Minnesota) | 913.71 mi (1,470.48 km) |
| Gaithersburg to Bloomsburg (Pennsylvania) | 135.14 mi (217.48 km) |
| Gaithersburg to Blue Ash (Ohio) | 383.91 mi (617.85 km) |
