| Potomac to Benavente | 3,579.44 mi (5,760.56 km) |
| Potomac to Bombarral | 3,553.77 mi (5,719.24 km) |
| Potomac to Bougado | 3,528.87 mi (5,679.17 km) |
| Potomac to Braga | 3,530.17 mi (5,681.26 km) |
| Potomac to Braganca | 3,603.25 mi (5,798.86 km) |
| Potomac to Cabeceiras de Basto | 3,550.00 mi (5,713.17 km) |
| Potomac to Cacem | 3,559.65 mi (5,728.70 km) |
| Potomac to Cadaval | 3,557.43 mi (5,725.13 km) |
| Potomac to Caldas da Rainha | 3,551.01 mi (5,714.80 km) |
| Potomac to Calheta | 3,328.49 mi (5,356.68 km) |
| Potomac to Camara de Lobos | 3,339.25 mi (5,374.00 km) |
| Potomac to Canico | 3,347.56 mi (5,387.38 km) |
| Potomac to Cantanhede | 3,552.71 mi (5,717.54 km) |
| Potomac to Carregal do Sal | 3,579.34 mi (5,760.38 km) |
| Potomac to Cartaxo | 3,575.29 mi (5,753.87 km) |
