| Boppard to Silver Firs (Washington) | 5,030.40 mi (8,095.65 km) |
| Boppard to Silver Spring (Maryland) | 4,005.03 mi (6,445.47 km) |
| Boppard to Silver Springs Shores (Florida) | 4,684.67 mi (7,539.24 km) |
| Boppard to Silverdale (Washington) | 5,054.79 mi (8,134.90 km) |
| Boppard to Silverton (Oregon) | 5,215.82 mi (8,394.04 km) |
| Boppard to Simi Valley (California) | 5,744.18 mi (9,244.36 km) |
| Boppard to Simpsonville (South Carolina) | 4,417.96 mi (7,110.02 km) |
| Boppard to Sioux City (Iowa) | 4,566.43 mi (7,348.96 km) |
| Boppard to Sioux Falls (South Dakota) | 4,525.27 mi (7,282.73 km) |
| Boppard to Skokie (Illinois) | 4,279.02 mi (6,886.41 km) |
| Boppard to Sleepy Hollow (New York) | 3,784.62 mi (6,090.75 km) |
| Boppard to Slidell (Louisiana) | 4,942.38 mi (7,953.99 km) |
| Boppard to Smithfield (North Carolina) | 4,221.27 mi (6,793.47 km) |
| Boppard to Smithfield (Utah) | 5,100.81 mi (8,208.96 km) |
| Boppard to Smithville (Missouri) | 4,659.82 mi (7,499.26 km) |
