| Potomac to Alenquer | 3,566.48 mi (5,739.70 km) |
| Potomac to Alfena | 3,533.01 mi (5,685.83 km) |
| Potomac to Alijo | 3,582.67 mi (5,765.75 km) |
| Potomac to Aljustrel | 3,639.97 mi (5,857.97 km) |
| Potomac to Almada | 3,569.52 mi (5,744.59 km) |
| Potomac to Almargem | 3,559.37 mi (5,728.26 km) |
| Potomac to Almeirim | 3,582.15 mi (5,764.91 km) |
| Potomac to Amadora | 3,564.36 mi (5,736.29 km) |
| Potomac to Amarante | 3,554.41 mi (5,720.27 km) |
| Potomac to Amares | 3,532.66 mi (5,685.27 km) |
| Potomac to Amora | 3,572.95 mi (5,750.10 km) |
| Potomac to Anadia | 3,558.26 mi (5,726.47 km) |
| Potomac to Angra do Heroismo | 2,655.00 mi (4,272.81 km) |
| Potomac to Ansiao | 3,571.90 mi (5,748.42 km) |
| Potomac to Anta | 3,534.09 mi (5,687.56 km) |
