| Silver Spring to Arcos de Valdevez | 3,514.79 mi (5,656.51 km) |
| Silver Spring to Arcozelo | 3,524.08 mi (5,671.46 km) |
| Silver Spring to Arganil | 3,574.27 mi (5,752.24 km) |
| Silver Spring to Arouca | 3,546.31 mi (5,707.24 km) |
| Silver Spring to Arruda dos Vinhos | 3,557.54 mi (5,725.31 km) |
| Silver Spring to Aveiro | 3,534.40 mi (5,688.07 km) |
| Silver Spring to Aver-o-Mar | 3,509.01 mi (5,647.20 km) |
| Silver Spring to Aves | 3,530.72 mi (5,682.15 km) |
| Silver Spring to Azambuja | 3,565.17 mi (5,737.59 km) |
| Silver Spring to Baiao | 3,550.56 mi (5,714.07 km) |
| Silver Spring to Barcelos | 3,513.52 mi (5,654.47 km) |
| Silver Spring to Barreiro | 3,566.13 mi (5,739.13 km) |
| Silver Spring to Batalha | 3,552.83 mi (5,717.73 km) |
| Silver Spring to Beja | 3,642.43 mi (5,861.92 km) |
| Silver Spring to Belas | 3,553.02 mi (5,718.03 km) |
