| Gaithersburg to Beocin | 4,667.84 mi (7,512.16 km) |
| Gaithersburg to Blace | 4,805.63 mi (7,733.92 km) |
| Gaithersburg to Bogatic | 4,671.68 mi (7,518.34 km) |
| Gaithersburg to Bojnik | 4,834.49 mi (7,780.36 km) |
| Gaithersburg to Boljevac | 4,811.71 mi (7,743.70 km) |
| Gaithersburg to Bor | 4,805.69 mi (7,734.02 km) |
| Gaithersburg to Borca | 4,709.60 mi (7,579.37 km) |
| Gaithersburg to Bosilegrad | 4,886.29 mi (7,863.72 km) |
| Gaithersburg to Brus | 4,791.61 mi (7,711.35 km) |
| Gaithersburg to Bujanovac | 4,858.44 mi (7,818.91 km) |
| Gaithersburg to Cacak | 4,743.53 mi (7,633.98 km) |
| Gaithersburg to Cajetina | 4,722.93 mi (7,600.82 km) |
| Gaithersburg to Cicevac | 4,795.52 mi (7,717.65 km) |
| Gaithersburg to Coka | 4,656.61 mi (7,494.10 km) |
| Gaithersburg to Crna Trava | 4,866.61 mi (7,832.05 km) |
