| Gaithersburg to Benavente | 3,577.11 mi (5,756.80 km) |
| Gaithersburg to Bombarral | 3,551.41 mi (5,715.44 km) |
| Gaithersburg to Bougado | 3,526.13 mi (5,674.76 km) |
| Gaithersburg to Braga | 3,527.39 mi (5,676.78 km) |
| Gaithersburg to Braganca | 3,600.34 mi (5,794.19 km) |
| Gaithersburg to Cabeceiras de Basto | 3,547.20 mi (5,708.67 km) |
| Gaithersburg to Cacem | 3,557.38 mi (5,725.04 km) |
| Gaithersburg to Cadaval | 3,555.07 mi (5,721.33 km) |
| Gaithersburg to Caldas da Rainha | 3,548.62 mi (5,710.95 km) |
| Gaithersburg to Calheta | 3,327.74 mi (5,355.49 km) |
| Gaithersburg to Camara de Lobos | 3,338.50 mi (5,372.79 km) |
| Gaithersburg to Canico | 3,346.81 mi (5,386.17 km) |
| Gaithersburg to Cantanhede | 3,550.14 mi (5,713.40 km) |
| Gaithersburg to Carregal do Sal | 3,576.72 mi (5,756.17 km) |
| Gaithersburg to Cartaxo | 3,572.93 mi (5,750.07 km) |
