| Box Elder to Silver Firs (Washington) | 948.60 mi (1,526.63 km) |
| Box Elder to Silver Spring (Maryland) | 1,386.43 mi (2,231.25 km) |
| Box Elder to Silver Springs Shores (Florida) | 1,553.33 mi (2,499.84 km) |
| Box Elder to Silverdale (Washington) | 971.20 mi (1,563.00 km) |
| Box Elder to Silverton (Oregon) | 969.38 mi (1,560.07 km) |
| Box Elder to Simi Valley (California) | 1,076.92 mi (1,733.13 km) |
| Box Elder to Simpsonville (South Carolina) | 1,281.38 mi (2,062.18 km) |
| Box Elder to Sioux City (Iowa) | 354.39 mi (570.33 km) |
| Box Elder to Sioux Falls (South Dakota) | 318.94 mi (513.29 km) |
| Box Elder to Skokie (Illinois) | 786.27 mi (1,265.38 km) |
| Box Elder to Sleepy Hollow (New York) | 1,492.09 mi (2,401.28 km) |
| Box Elder to Slidell (Louisiana) | 1,199.96 mi (1,931.15 km) |
| Box Elder to Smithfield (North Carolina) | 1,433.50 mi (2,306.99 km) |
| Box Elder to Smithfield (Utah) | 468.95 mi (754.70 km) |
| Box Elder to Smithville (Missouri) | 546.01 mi (878.71 km) |
