| Waterloo to Silver Firs (Washington) | 4,924.28 mi (7,924.86 km) |
| Waterloo to Silver Spring (Maryland) | 3,862.11 mi (6,215.47 km) |
| Waterloo to Silver Springs Shores (Florida) | 4,540.21 mi (7,306.76 km) |
| Waterloo to Silverdale (Washington) | 4,949.03 mi (7,964.69 km) |
| Waterloo to Silverton (Oregon) | 5,107.70 mi (8,220.05 km) |
| Waterloo to Simi Valley (California) | 5,623.11 mi (9,049.51 km) |
| Waterloo to Simpsonville (South Carolina) | 4,274.90 mi (6,879.79 km) |
| Waterloo to Sioux City (Iowa) | 4,434.09 mi (7,135.97 km) |
| Waterloo to Sioux Falls (South Dakota) | 4,393.98 mi (7,071.42 km) |
| Waterloo to Skokie (Illinois) | 4,141.66 mi (6,665.35 km) |
| Waterloo to Sleepy Hollow (New York) | 3,641.73 mi (5,860.79 km) |
| Waterloo to Slidell (Louisiana) | 4,800.04 mi (7,724.92 km) |
| Waterloo to Smithfield (North Carolina) | 4,077.52 mi (6,562.14 km) |
| Waterloo to Smithfield (Utah) | 4,979.31 mi (8,013.43 km) |
| Waterloo to Smithville (Missouri) | 4,524.19 mi (7,280.97 km) |
