| Gaithersburg to Benisa | 4,015.65 mi (6,462.57 km) |
| Gaithersburg to Berga | 3,995.95 mi (6,430.86 km) |
| Gaithersburg to Berja | 3,928.14 mi (6,321.74 km) |
| Gaithersburg to Bermeo | 3,747.10 mi (6,030.38 km) |
| Gaithersburg to Berriozar | 3,811.93 mi (6,134.72 km) |
| Gaithersburg to Betanzos | 3,494.58 mi (5,623.98 km) |
| Gaithersburg to Betera | 3,963.78 mi (6,379.09 km) |
| Gaithersburg to Bilbao | 3,742.36 mi (6,022.75 km) |
| Gaithersburg to Binefar | 3,931.82 mi (6,327.65 km) |
| Gaithersburg to Binisalem | 4,117.23 mi (6,626.04 km) |
| Gaithersburg to Blanes | 4,052.63 mi (6,522.08 km) |
| Gaithersburg to Boadilla del Monte | 3,776.46 mi (6,077.62 km) |
| Gaithersburg to Boiro | 3,477.11 mi (5,595.87 km) |
| Gaithersburg to Bolanos de Calatrava | 3,828.39 mi (6,161.19 km) |
| Gaithersburg to Bollullos de la Mitacion | 3,755.68 mi (6,044.18 km) |
