| Spa to Silver Firs (Washington) | 4,973.61 mi (8,004.26 km) |
| Spa to Silver Spring (Maryland) | 3,928.05 mi (6,321.59 km) |
| Spa to Silver Springs Shores (Florida) | 4,606.80 mi (7,413.93 km) |
| Spa to Silverdale (Washington) | 4,998.20 mi (8,043.83 km) |
| Spa to Silverton (Oregon) | 5,157.96 mi (8,300.94 km) |
| Spa to Simi Valley (California) | 5,679.29 mi (9,139.93 km) |
| Spa to Simpsonville (South Carolina) | 4,340.91 mi (6,986.01 km) |
| Spa to Sioux City (Iowa) | 4,495.32 mi (7,234.52 km) |
| Spa to Sioux Falls (South Dakota) | 4,454.74 mi (7,169.20 km) |
| Spa to Skokie (Illinois) | 4,205.14 mi (6,767.52 km) |
| Spa to Sleepy Hollow (New York) | 3,707.65 mi (5,966.89 km) |
| Spa to Slidell (Louisiana) | 4,865.74 mi (7,830.65 km) |
| Spa to Smithfield (North Carolina) | 4,143.82 mi (6,668.83 km) |
| Spa to Smithfield (Utah) | 5,035.65 mi (8,104.10 km) |
| Spa to Smithville (Missouri) | 4,586.90 mi (7,381.91 km) |
