| Gaithersburg to Ayr | 3,409.33 mi (5,486.79 km) |
| Gaithersburg to Bacup | 3,533.46 mi (5,686.56 km) |
| Gaithersburg to Baguley | 3,536.19 mi (5,690.95 km) |
| Gaithersburg to Baildon | 3,547.80 mi (5,709.64 km) |
| Gaithersburg to Bailleston | 3,422.97 mi (5,508.73 km) |
| Gaithersburg to Balderton | 3,602.57 mi (5,797.78 km) |
| Gaithersburg to Baldock | 3,648.41 mi (5,871.55 km) |
| Gaithersburg to Balham | 3,661.98 mi (5,893.39 km) |
| Gaithersburg to Bamber Bridge | 3,514.84 mi (5,656.58 km) |
| Gaithersburg to Banbridge | 3,362.87 mi (5,412.01 km) |
| Gaithersburg to Banbury | 3,600.56 mi (5,794.54 km) |
| Gaithersburg to Bangor | 3,381.21 mi (5,441.54 km) |
| Gaithersburg to Bangor | 3,465.64 mi (5,577.41 km) |
| Gaithersburg to Banstead | 3,662.59 mi (5,894.37 km) |
| Gaithersburg to Bargoed | 3,530.50 mi (5,681.80 km) |
