| Risca to Silver Firs (Washington) | 4,680.25 mi (7,532.14 km) |
| Risca to Silver Spring (Maryland) | 3,536.20 mi (5,690.96 km) |
| Risca to Silver Springs Shores (Florida) | 4,211.26 mi (6,777.37 km) |
| Risca to Silverdale (Washington) | 4,705.78 mi (7,573.22 km) |
| Risca to Silverton (Oregon) | 4,858.72 mi (7,819.35 km) |
| Risca to Simi Valley (California) | 5,344.08 mi (8,600.47 km) |
| Risca to Simpsonville (South Carolina) | 3,948.63 mi (6,354.71 km) |
| Risca to Sioux City (Iowa) | 4,131.32 mi (6,648.71 km) |
| Risca to Sioux Falls (South Dakota) | 4,093.61 mi (6,588.03 km) |
| Risca to Skokie (Illinois) | 3,827.82 mi (6,160.28 km) |
| Risca to Sleepy Hollow (New York) | 3,315.90 mi (5,336.43 km) |
| Risca to Slidell (Louisiana) | 4,475.18 mi (7,202.11 km) |
| Risca to Smithfield (North Carolina) | 3,749.90 mi (6,034.88 km) |
| Risca to Smithfield (Utah) | 4,700.31 mi (7,564.42 km) |
| Risca to Smithville (Missouri) | 4,213.94 mi (6,781.68 km) |
