| Mercer Island to Sesimbra | 5,212.90 mi (8,389.36 km) |
| Mercer Island to Setubal | 5,215.80 mi (8,394.02 km) |
| Mercer Island to Sever do Vouga | 5,116.56 mi (8,234.31 km) |
| Mercer Island to Silves | 5,302.79 mi (8,534.02 km) |
| Mercer Island to Sines | 5,247.04 mi (8,444.30 km) |
| Mercer Island to Sintra | 5,184.07 mi (8,342.95 km) |
| Mercer Island to Sobrado de Paiva | 5,104.02 mi (8,214.12 km) |
| Mercer Island to Sobral de Monte Agraco | 5,180.66 mi (8,337.47 km) |
| Mercer Island to Soure | 5,143.76 mi (8,278.08 km) |
| Mercer Island to Tabua | 5,147.70 mi (8,284.42 km) |
| Mercer Island to Tavira | 5,334.00 mi (8,584.24 km) |
| Mercer Island to Tomar | 5,175.00 mi (8,328.36 km) |
| Mercer Island to Tondela | 5,137.57 mi (8,268.12 km) |
| Mercer Island to Torre de Moncorvo | 5,132.81 mi (8,260.45 km) |
| Mercer Island to Torres Novas | 5,178.10 mi (8,333.35 km) |
