| Port Huron to Arcos de Valdevez | 3,646.79 mi (5,868.94 km) |
| Port Huron to Arcozelo | 3,662.55 mi (5,894.31 km) |
| Port Huron to Arganil | 3,717.33 mi (5,982.46 km) |
| Port Huron to Arouca | 3,684.65 mi (5,929.87 km) |
| Port Huron to Arruda dos Vinhos | 3,712.22 mi (5,974.24 km) |
| Port Huron to Aveiro | 3,676.01 mi (5,915.97 km) |
| Port Huron to Aver-o-Mar | 3,645.22 mi (5,866.42 km) |
| Port Huron to Aves | 3,665.46 mi (5,898.98 km) |
| Port Huron to Azambuja | 3,718.71 mi (5,984.68 km) |
| Port Huron to Baiao | 3,686.62 mi (5,933.04 km) |
| Port Huron to Barcelos | 3,648.50 mi (5,871.70 km) |
| Port Huron to Barreiro | 3,723.06 mi (5,991.68 km) |
| Port Huron to Batalha | 3,702.00 mi (5,957.79 km) |
| Port Huron to Beja | 3,800.49 mi (6,116.30 km) |
| Port Huron to Belas | 3,709.74 mi (5,970.25 km) |
