| Gaithersburg to Bilecik | 5,293.01 mi (8,518.27 km) |
| Gaithersburg to Bingol | 5,760.46 mi (9,270.57 km) |
| Gaithersburg to Birecik | 5,756.24 mi (9,263.78 km) |
| Gaithersburg to Bitlis | 5,844.34 mi (9,405.56 km) |
| Gaithersburg to Bodrum | 5,325.26 mi (8,570.18 km) |
| Gaithersburg to Bogazliyan | 5,545.39 mi (8,924.44 km) |
| Gaithersburg to Bolu | 5,331.17 mi (8,579.69 km) |
| Gaithersburg to Bolvadin | 5,400.65 mi (8,691.51 km) |
| Gaithersburg to Bor | 5,580.64 mi (8,981.17 km) |
| Gaithersburg to Borcka | 5,679.12 mi (9,139.66 km) |
| Gaithersburg to Boyabat | 5,419.92 mi (8,722.52 km) |
| Gaithersburg to Bozdogan | 5,334.56 mi (8,585.14 km) |
| Gaithersburg to Bozkir | 5,519.46 mi (8,882.72 km) |
| Gaithersburg to Bozkurt | 5,382.58 mi (8,662.42 km) |
| Gaithersburg to Bozuyuk | 5,305.86 mi (8,538.96 km) |
