| Boulder to Arcos de Valdevez | 4,755.51 mi (7,653.26 km) |
| Boulder to Arcozelo | 4,777.92 mi (7,689.32 km) |
| Boulder to Arganil | 4,836.66 mi (7,783.85 km) |
| Boulder to Arouca | 4,799.54 mi (7,724.12 km) |
| Boulder to Arruda dos Vinhos | 4,843.17 mi (7,794.33 km) |
| Boulder to Aveiro | 4,794.44 mi (7,715.91 km) |
| Boulder to Aver-o-Mar | 4,758.48 mi (7,658.03 km) |
| Boulder to Aves | 4,776.83 mi (7,687.56 km) |
| Boulder to Azambuja | 4,848.48 mi (7,802.87 km) |
| Boulder to Baiao | 4,799.08 mi (7,723.38 km) |
| Boulder to Barcelos | 4,760.40 mi (7,661.13 km) |
| Boulder to Barreiro | 4,856.03 mi (7,815.02 km) |
| Boulder to Batalha | 4,827.71 mi (7,769.45 km) |
| Boulder to Beja | 4,933.61 mi (7,939.87 km) |
| Boulder to Belas | 4,842.67 mi (7,793.53 km) |
