| Dumbarton to Arcos de Valdevez | 989.60 mi (1,592.61 km) |
| Dumbarton to Arcozelo | 1,045.41 mi (1,682.42 km) |
| Dumbarton to Arganil | 1,098.48 mi (1,767.83 km) |
| Dumbarton to Arouca | 1,050.75 mi (1,691.02 km) |
| Dumbarton to Arruda dos Vinhos | 1,190.35 mi (1,915.69 km) |
| Dumbarton to Aveiro | 1,074.33 mi (1,728.96 km) |
| Dumbarton to Aver-o-Mar | 1,022.68 mi (1,645.85 km) |
| Dumbarton to Aves | 1,016.52 mi (1,635.93 km) |
| Dumbarton to Azambuja | 1,183.09 mi (1,904.00 km) |
| Dumbarton to Baiao | 1,033.33 mi (1,662.98 km) |
| Dumbarton to Barcelos | 1,013.74 mi (1,631.46 km) |
| Dumbarton to Barreiro | 1,211.99 mi (1,950.51 km) |
| Dumbarton to Batalha | 1,142.69 mi (1,838.99 km) |
| Dumbarton to Beja | 1,247.39 mi (2,007.49 km) |
| Dumbarton to Belas | 1,206.21 mi (1,941.21 km) |
