| Mackworth to Silver Firs (Washington) | 4,650.80 mi (7,484.74 km) |
| Mackworth to Silver Spring (Maryland) | 3,573.15 mi (5,750.44 km) |
| Mackworth to Silver Springs Shores (Florida) | 4,257.53 mi (6,851.84 km) |
| Mackworth to Silverdale (Washington) | 4,675.95 mi (7,525.22 km) |
| Mackworth to Silverton (Oregon) | 4,831.84 mi (7,776.10 km) |
| Mackworth to Simi Valley (California) | 5,334.51 mi (8,585.06 km) |
| Mackworth to Simpsonville (South Carolina) | 3,986.27 mi (6,415.29 km) |
| Mackworth to Sioux City (Iowa) | 4,139.22 mi (6,661.44 km) |
| Mackworth to Sioux Falls (South Dakota) | 4,099.44 mi (6,597.41 km) |
| Mackworth to Skokie (Illinois) | 3,846.67 mi (6,190.62 km) |
| Mackworth to Sleepy Hollow (New York) | 3,352.73 mi (5,395.70 km) |
| Mackworth to Slidell (Louisiana) | 4,509.68 mi (7,257.63 km) |
| Mackworth to Smithfield (North Carolina) | 3,791.19 mi (6,101.32 km) |
| Mackworth to Smithfield (Utah) | 4,690.57 mi (7,548.74 km) |
| Mackworth to Smithville (Missouri) | 4,228.92 mi (6,805.79 km) |
