| Round Rock to Arcos de Valdevez | 4,814.17 mi (7,747.66 km) |
| Round Rock to Arcozelo | 4,825.37 mi (7,765.68 km) |
| Round Rock to Arganil | 4,876.76 mi (7,848.39 km) |
| Round Rock to Arouca | 4,847.59 mi (7,801.44 km) |
| Round Rock to Arruda dos Vinhos | 4,862.14 mi (7,824.86 km) |
| Round Rock to Aveiro | 4,836.50 mi (7,783.59 km) |
| Round Rock to Aver-o-Mar | 4,809.65 mi (7,740.38 km) |
| Round Rock to Aves | 4,830.97 mi (7,774.69 km) |
| Round Rock to Azambuja | 4,869.62 mi (7,836.89 km) |
| Round Rock to Baiao | 4,851.21 mi (7,807.27 km) |
| Round Rock to Barcelos | 4,813.81 mi (7,747.09 km) |
| Round Rock to Barreiro | 4,871.02 mi (7,839.16 km) |
| Round Rock to Batalha | 4,856.55 mi (7,815.86 km) |
| Round Rock to Beja | 4,947.50 mi (7,962.23 km) |
| Round Rock to Belas | 4,857.88 mi (7,818.01 km) |
