| Middle River to Arcos de Valdevez | 3,475.76 mi (5,593.69 km) |
| Middle River to Arcozelo | 3,485.18 mi (5,608.86 km) |
| Middle River to Arganil | 3,535.48 mi (5,689.81 km) |
| Middle River to Arouca | 3,507.41 mi (5,644.63 km) |
| Middle River to Arruda dos Vinhos | 3,519.03 mi (5,663.33 km) |
| Middle River to Aveiro | 3,495.57 mi (5,625.58 km) |
| Middle River to Aver-o-Mar | 3,470.06 mi (5,584.52 km) |
| Middle River to Aves | 3,491.74 mi (5,619.42 km) |
| Middle River to Azambuja | 3,526.63 mi (5,675.57 km) |
| Middle River to Baiao | 3,511.61 mi (5,651.39 km) |
| Middle River to Barcelos | 3,474.55 mi (5,591.75 km) |
| Middle River to Barreiro | 3,527.68 mi (5,677.25 km) |
| Middle River to Batalha | 3,514.18 mi (5,655.52 km) |
| Middle River to Beja | 3,604.02 mi (5,800.12 km) |
| Middle River to Belas | 3,514.56 mi (5,656.14 km) |
