| Portchester to Silver Firs (Washington) | 4,774.85 mi (7,684.37 km) |
| Portchester to Silver Spring (Maryland) | 3,633.44 mi (5,847.46 km) |
| Portchester to Silver Springs Shores (Florida) | 4,305.78 mi (6,929.48 km) |
| Portchester to Silverdale (Washington) | 4,800.26 mi (7,725.27 km) |
| Portchester to Silverton (Oregon) | 4,954.09 mi (7,972.84 km) |
| Portchester to Simi Valley (California) | 5,443.17 mi (8,759.94 km) |
| Portchester to Simpsonville (South Carolina) | 4,045.65 mi (6,510.85 km) |
| Portchester to Sioux City (Iowa) | 4,231.68 mi (6,810.23 km) |
| Portchester to Sioux Falls (South Dakota) | 4,193.94 mi (6,749.49 km) |
| Portchester to Skokie (Illinois) | 3,927.81 mi (6,321.21 km) |
| Portchester to Sleepy Hollow (New York) | 3,413.22 mi (5,493.04 km) |
| Portchester to Slidell (Louisiana) | 4,572.84 mi (7,359.28 km) |
| Portchester to Smithfield (North Carolina) | 3,846.01 mi (6,189.55 km) |
| Portchester to Smithfield (Utah) | 4,799.34 mi (7,723.79 km) |
| Portchester to Smithville (Missouri) | 4,314.16 mi (6,942.97 km) |
