| Mercer Island to Arcos de Valdevez | 5,055.90 mi (8,136.69 km) |
| Mercer Island to Arcozelo | 5,090.35 mi (8,192.12 km) |
| Mercer Island to Arganil | 5,154.43 mi (8,295.26 km) |
| Mercer Island to Arouca | 5,110.02 mi (8,223.78 km) |
| Mercer Island to Arruda dos Vinhos | 5,185.44 mi (8,345.16 km) |
| Mercer Island to Aveiro | 5,112.32 mi (8,227.48 km) |
| Mercer Island to Aver-o-Mar | 5,067.61 mi (8,155.54 km) |
| Mercer Island to Aves | 5,081.37 mi (8,177.67 km) |
| Mercer Island to Azambuja | 5,187.91 mi (8,349.13 km) |
| Mercer Island to Baiao | 5,104.74 mi (8,215.28 km) |
| Mercer Island to Barcelos | 5,066.76 mi (8,154.15 km) |
| Mercer Island to Barreiro | 5,202.22 mi (8,372.16 km) |
| Mercer Island to Batalha | 5,159.28 mi (8,303.06 km) |
| Mercer Island to Beja | 5,276.80 mi (8,492.19 km) |
| Mercer Island to Belas | 5,189.37 mi (8,351.48 km) |
