| Mason City to Arcos de Valdevez | 4,119.52 mi (6,629.73 km) |
| Mason City to Arcozelo | 4,139.52 mi (6,661.91 km) |
| Mason City to Arganil | 4,196.92 mi (6,754.28 km) |
| Mason City to Arouca | 4,161.35 mi (6,697.05 km) |
| Mason City to Arruda dos Vinhos | 4,199.31 mi (6,758.13 km) |
| Mason City to Aveiro | 4,154.96 mi (6,686.75 km) |
| Mason City to Aver-o-Mar | 4,120.82 mi (6,631.82 km) |
| Mason City to Aves | 4,139.89 mi (6,662.52 km) |
| Mason City to Azambuja | 4,205.03 mi (6,767.34 km) |
| Mason City to Baiao | 4,161.79 mi (6,697.75 km) |
| Mason City to Barcelos | 4,123.24 mi (6,635.72 km) |
| Mason City to Barreiro | 4,211.48 mi (6,777.72 km) |
| Mason City to Batalha | 4,185.66 mi (6,736.17 km) |
| Mason City to Beja | 4,289.11 mi (6,902.66 km) |
| Mason City to Belas | 4,198.12 mi (6,756.23 km) |
