| Witham to Silver Firs (Washington) | 4,768.78 mi (7,674.60 km) |
| Witham to Silver Spring (Maryland) | 3,684.29 mi (5,929.30 km) |
| Witham to Silver Springs Shores (Florida) | 4,364.24 mi (7,023.57 km) |
| Witham to Silverdale (Washington) | 4,793.84 mi (7,714.94 km) |
| Witham to Silverton (Oregon) | 4,950.34 mi (7,966.80 km) |
| Witham to Simi Valley (California) | 5,454.93 mi (8,778.86 km) |
| Witham to Simpsonville (South Carolina) | 4,097.17 mi (6,593.76 km) |
| Witham to Sioux City (Iowa) | 4,258.63 mi (6,853.61 km) |
| Witham to Sioux Falls (South Dakota) | 4,219.12 mi (6,790.02 km) |
| Witham to Skokie (Illinois) | 3,963.94 mi (6,379.35 km) |
| Witham to Sleepy Hollow (New York) | 3,463.89 mi (5,574.59 km) |
| Witham to Slidell (Louisiana) | 4,621.96 mi (7,438.33 km) |
| Witham to Smithfield (North Carolina) | 3,900.38 mi (6,277.06 km) |
| Witham to Smithfield (Utah) | 4,810.99 mi (7,742.54 km) |
| Witham to Smithville (Missouri) | 4,347.10 mi (6,995.99 km) |
