| Povoa de Santa Iria to Silver Firs (Washington) | 5,175.16 mi (8,328.62 km) |
| Povoa de Santa Iria to Silver Spring (Maryland) | 3,560.71 mi (5,730.41 km) |
| Povoa de Santa Iria to Silver Springs Shores (Florida) | 4,123.71 mi (6,636.47 km) |
| Povoa de Santa Iria to Silverdale (Washington) | 5,202.65 mi (8,372.85 km) |
| Povoa de Santa Iria to Silverton (Oregon) | 5,330.98 mi (8,579.39 km) |
| Povoa de Santa Iria to Simi Valley (California) | 5,676.07 mi (9,134.75 km) |
| Povoa de Santa Iria to Simpsonville (South Carolina) | 3,948.19 mi (6,354.00 km) |
| Povoa de Santa Iria to Sioux City (Iowa) | 4,367.49 mi (7,028.80 km) |
| Povoa de Santa Iria to Sioux Falls (South Dakota) | 4,347.30 mi (6,996.30 km) |
| Povoa de Santa Iria to Skokie (Illinois) | 3,989.53 mi (6,420.52 km) |
| Povoa de Santa Iria to Sleepy Hollow (New York) | 3,353.01 mi (5,396.15 km) |
| Povoa de Santa Iria to Slidell (Louisiana) | 4,480.85 mi (7,211.23 km) |
| Povoa de Santa Iria to Smithfield (North Carolina) | 3,726.47 mi (5,997.18 km) |
| Povoa de Santa Iria to Smithfield (Utah) | 5,052.03 mi (8,130.46 km) |
| Povoa de Santa Iria to Smithville (Missouri) | 4,391.19 mi (7,066.94 km) |
