| Gaithersburg to Belvedere Marittimo | 4,716.52 mi (7,590.51 km) |
| Gaithersburg to Benevento | 4,611.64 mi (7,421.71 km) |
| Gaithersburg to Bergamo | 4,231.35 mi (6,809.69 km) |
| Gaithersburg to Bernalda | 4,721.97 mi (7,599.27 km) |
| Gaithersburg to Bertinoro | 4,388.45 mi (7,062.53 km) |
| Gaithersburg to Besana in Brianza | 4,214.68 mi (6,782.88 km) |
| Gaithersburg to Besozzo | 4,183.54 mi (6,732.76 km) |
| Gaithersburg to Biancavilla | 4,746.77 mi (7,639.18 km) |
| Gaithersburg to Biassono | 4,216.12 mi (6,785.19 km) |
| Gaithersburg to Bibbiano | 4,299.26 mi (6,918.99 km) |
| Gaithersburg to Bibbiena | 4,390.33 mi (7,065.55 km) |
| Gaithersburg to Biella | 4,166.76 mi (6,705.75 km) |
| Gaithersburg to Bisceglie | 4,682.73 mi (7,536.13 km) |
| Gaithersburg to Bisignano | 4,738.82 mi (7,626.40 km) |
| Gaithersburg to Bitetto | 4,701.34 mi (7,566.07 km) |
