| Gaithersburg to Beverly Hills (California) | 2,291.28 mi (3,687.45 km) |
| Gaithersburg to Beverly Hills (Florida) | 766.69 mi (1,233.87 km) |
| Gaithersburg to Beverly Hills (Michigan) | 392.43 mi (631.56 km) |
| Gaithersburg to Bexley (Ohio) | 310.10 mi (499.05 km) |
| Gaithersburg to Biddeford (Maine) | 461.04 mi (741.97 km) |
| Gaithersburg to Big Bear City (California) | 2,200.83 mi (3,541.89 km) |
| Gaithersburg to Big Lake (Minnesota) | 945.66 mi (1,521.89 km) |
| Gaithersburg to Big Spring (Texas) | 1,437.47 mi (2,313.39 km) |
| Gaithersburg to Billings (Montana) | 1,650.39 mi (2,656.05 km) |
| Gaithersburg to Biloxi (Mississippi) | 895.40 mi (1,441.00 km) |
| Gaithersburg to Binghamton (New York) | 216.08 mi (347.75 km) |
| Gaithersburg to Birmingham (Alabama) | 658.65 mi (1,060.00 km) |
| Gaithersburg to Birmingham (Michigan) | 392.25 mi (631.26 km) |
| Gaithersburg to Bismarck (North Dakota) | 1,297.17 mi (2,087.59 km) |
| Gaithersburg to Bithlo (Florida) | 763.53 mi (1,228.78 km) |
