| Herndon to Arcos de Valdevez | 3,533.37 mi (5,686.42 km) |
| Herndon to Arcozelo | 3,542.79 mi (5,701.56 km) |
| Herndon to Arganil | 3,593.06 mi (5,782.48 km) |
| Herndon to Arouca | 3,565.02 mi (5,737.34 km) |
| Herndon to Arruda dos Vinhos | 3,576.52 mi (5,755.85 km) |
| Herndon to Aveiro | 3,553.16 mi (5,718.26 km) |
| Herndon to Aver-o-Mar | 3,527.67 mi (5,677.23 km) |
| Herndon to Aves | 3,549.36 mi (5,712.14 km) |
| Herndon to Azambuja | 3,584.13 mi (5,768.10 km) |
| Herndon to Baiao | 3,569.22 mi (5,744.10 km) |
| Herndon to Barcelos | 3,532.16 mi (5,684.47 km) |
| Herndon to Barreiro | 3,585.14 mi (5,769.73 km) |
| Herndon to Batalha | 3,571.72 mi (5,748.13 km) |
| Herndon to Beja | 3,661.47 mi (5,892.56 km) |
| Herndon to Belas | 3,572.03 mi (5,748.63 km) |
