| Philadelphia to Silver Firs (Washington) | 2,362.88 mi (3,802.68 km) |
| Philadelphia to Silver Spring (Maryland) | 122.22 mi (196.69 km) |
| Philadelphia to Silver Springs Shores (Florida) | 847.82 mi (1,364.43 km) |
| Philadelphia to Silverdale (Washington) | 2,388.69 mi (3,844.23 km) |
| Philadelphia to Silverton (Oregon) | 2,415.99 mi (3,888.17 km) |
| Philadelphia to Simi Valley (California) | 2,410.56 mi (3,879.43 km) |
| Philadelphia to Simpsonville (South Carolina) | 534.47 mi (860.14 km) |
| Philadelphia to Sioux City (Iowa) | 1,114.45 mi (1,793.53 km) |
| Philadelphia to Sioux Falls (South Dakota) | 1,135.85 mi (1,827.98 km) |
| Philadelphia to Skokie (Illinois) | 671.24 mi (1,080.26 km) |
| Philadelphia to Sleepy Hollow (New York) | 100.08 mi (161.07 km) |
| Philadelphia to Slidell (Louisiana) | 1,063.25 mi (1,711.14 km) |
| Philadelphia to Smithfield (North Carolina) | 356.70 mi (574.05 km) |
| Philadelphia to Smithfield (Utah) | 1,905.21 mi (3,066.13 km) |
| Philadelphia to Smithville (Missouri) | 1,032.31 mi (1,661.34 km) |
