| Gaithersburg to Ayamonte | 3,696.62 mi (5,949.14 km) |
| Gaithersburg to Azcoitia | 3,772.86 mi (6,071.83 km) |
| Gaithersburg to Azpeitia | 3,774.88 mi (6,075.09 km) |
| Gaithersburg to Azuqueca de Henares | 3,800.98 mi (6,117.09 km) |
| Gaithersburg to Badajoz | 3,669.30 mi (5,905.17 km) |
| Gaithersburg to Badalona | 4,034.19 mi (6,492.41 km) |
| Gaithersburg to Baena | 3,836.94 mi (6,174.96 km) |
| Gaithersburg to Baeza | 3,867.55 mi (6,224.23 km) |
| Gaithersburg to Bailen | 3,849.85 mi (6,195.74 km) |
| Gaithersburg to Balaguer | 3,957.09 mi (6,368.32 km) |
| Gaithersburg to Banolas | 4,037.75 mi (6,498.12 km) |
| Gaithersburg to Baranain | 3,813.16 mi (6,136.69 km) |
| Gaithersburg to Barbadanes | 3,533.04 mi (5,685.87 km) |
| Gaithersburg to Barbastro | 3,918.26 mi (6,305.84 km) |
| Gaithersburg to Barcelona | 4,033.14 mi (6,490.71 km) |
