| Rhyl to Silver Firs (Washington) | 4,578.69 mi (7,368.70 km) |
| Rhyl to Silver Spring (Maryland) | 3,488.26 mi (5,613.81 km) |
| Rhyl to Silver Springs Shores (Florida) | 4,173.31 mi (6,716.30 km) |
| Rhyl to Silverdale (Washington) | 4,604.00 mi (7,409.43 km) |
| Rhyl to Silverton (Oregon) | 4,758.70 mi (7,658.39 km) |
| Rhyl to Simi Valley (California) | 5,255.54 mi (8,457.98 km) |
| Rhyl to Simpsonville (South Carolina) | 3,901.40 mi (6,278.69 km) |
| Rhyl to Sioux City (Iowa) | 4,056.25 mi (6,527.90 km) |
| Rhyl to Sioux Falls (South Dakota) | 4,016.82 mi (6,464.45 km) |
| Rhyl to Skokie (Illinois) | 3,762.27 mi (6,054.78 km) |
| Rhyl to Sleepy Hollow (New York) | 3,267.83 mi (5,259.07 km) |
| Rhyl to Slidell (Louisiana) | 4,424.70 mi (7,120.86 km) |
| Rhyl to Smithfield (North Carolina) | 3,706.52 mi (5,965.08 km) |
| Rhyl to Smithfield (Utah) | 4,611.59 mi (7,421.64 km) |
| Rhyl to Smithville (Missouri) | 4,144.94 mi (6,670.64 km) |
