| Mercer Island to Sestu | 5,731.49 mi (9,223.94 km) |
| Mercer Island to Settimo Torinese | 5,351.90 mi (8,613.05 km) |
| Mercer Island to Seveso | 5,356.74 mi (8,620.84 km) |
| Mercer Island to Sezze | 5,702.87 mi (9,177.88 km) |
| Mercer Island to Siano | 5,785.27 mi (9,310.50 km) |
| Mercer Island to Siena | 5,550.03 mi (8,931.92 km) |
| Mercer Island to Signa | 5,516.40 mi (8,877.78 km) |
| Mercer Island to Silea | 5,433.08 mi (8,743.70 km) |
| Mercer Island to Silvi Paese | 5,664.58 mi (9,116.27 km) |
| Mercer Island to Sinalunga | 5,566.13 mi (8,957.82 km) |
| Mercer Island to Siniscola | 5,671.94 mi (9,128.11 km) |
| Mercer Island to Sinnai | 5,734.33 mi (9,228.52 km) |
| Mercer Island to Siracusa | 6,028.99 mi (9,702.73 km) |
| Mercer Island to Solaro | 5,357.08 mi (8,621.38 km) |
| Mercer Island to Soliera | 5,454.93 mi (8,778.85 km) |
