| Southborough to Arcos de Valdevez | 763.39 mi (1,228.56 km) |
| Southborough to Arcozelo | 816.80 mi (1,314.51 km) |
| Southborough to Arganil | 854.74 mi (1,375.58 km) |
| Southborough to Arouca | 814.70 mi (1,311.13 km) |
| Southborough to Arruda dos Vinhos | 954.87 mi (1,536.72 km) |
| Southborough to Aveiro | 842.85 mi (1,356.44 km) |
| Southborough to Aver-o-Mar | 798.96 mi (1,285.80 km) |
| Southborough to Aves | 785.05 mi (1,263.41 km) |
| Southborough to Azambuja | 945.11 mi (1,521.01 km) |
| Southborough to Baiao | 795.35 mi (1,280.00 km) |
| Southborough to Barcelos | 788.30 mi (1,268.65 km) |
| Southborough to Barreiro | 974.71 mi (1,568.65 km) |
| Southborough to Batalha | 907.16 mi (1,459.93 km) |
| Southborough to Beja | 990.15 mi (1,593.49 km) |
| Southborough to Belas | 972.57 mi (1,565.20 km) |
