| Santo Tirso to Silver Firs (Washington) | 5,064.39 mi (8,150.35 km) |
| Santo Tirso to Silver Spring (Maryland) | 3,525.38 mi (5,673.55 km) |
| Santo Tirso to Silver Springs Shores (Florida) | 4,113.01 mi (6,619.26 km) |
| Santo Tirso to Silverdale (Washington) | 5,091.63 mi (8,194.18 km) |
| Santo Tirso to Silverton (Oregon) | 5,224.55 mi (8,408.10 km) |
| Santo Tirso to Simi Valley (California) | 5,595.32 mi (9,004.80 km) |
| Santo Tirso to Simpsonville (South Carolina) | 3,919.98 mi (6,308.60 km) |
| Santo Tirso to Sioux City (Iowa) | 4,298.38 mi (6,917.58 km) |
| Santo Tirso to Sioux Falls (South Dakota) | 4,274.99 mi (6,879.93 km) |
| Santo Tirso to Skokie (Illinois) | 3,931.75 mi (6,327.55 km) |
| Santo Tirso to Sleepy Hollow (New York) | 3,313.87 mi (5,333.16 km) |
| Santo Tirso to Slidell (Louisiana) | 4,454.41 mi (7,168.68 km) |
| Santo Tirso to Smithfield (North Carolina) | 3,701.23 mi (5,956.55 km) |
| Santo Tirso to Smithfield (Utah) | 4,965.49 mi (7,991.19 km) |
| Santo Tirso to Smithville (Missouri) | 4,332.74 mi (6,972.88 km) |
