| Castleford to Silver Firs (Washington) | 4,613.03 mi (7,423.96 km) |
| Castleford to Silver Spring (Maryland) | 3,565.01 mi (5,737.33 km) |
| Castleford to Silver Springs Shores (Florida) | 4,253.98 mi (6,846.12 km) |
| Castleford to Silverdale (Washington) | 4,638.05 mi (7,464.21 km) |
| Castleford to Silverton (Oregon) | 4,795.00 mi (7,716.80 km) |
| Castleford to Simi Valley (California) | 5,304.35 mi (8,536.53 km) |
| Castleford to Simpsonville (South Carolina) | 3,978.31 mi (6,402.47 km) |
| Castleford to Sioux City (Iowa) | 4,116.93 mi (6,625.56 km) |
| Castleford to Sioux Falls (South Dakota) | 4,076.23 mi (6,560.07 km) |
| Castleford to Skokie (Illinois) | 3,829.52 mi (6,163.02 km) |
| Castleford to Sleepy Hollow (New York) | 3,344.62 mi (5,382.65 km) |
| Castleford to Slidell (Louisiana) | 4,499.93 mi (7,241.93 km) |
| Castleford to Smithfield (North Carolina) | 3,785.18 mi (6,091.66 km) |
| Castleford to Smithfield (Utah) | 4,660.51 mi (7,500.36 km) |
| Castleford to Smithville (Missouri) | 4,209.82 mi (6,775.05 km) |
