| Waltham to Siloam Springs (Arkansas) | 1,312.14 mi (2,111.69 km) |
| Waltham to Silver Firs (Washington) | 2,464.60 mi (3,966.39 km) |
| Waltham to Silver Spring (Maryland) | 382.42 mi (615.45 km) |
| Waltham to Silver Springs Shores (Florida) | 1,096.26 mi (1,764.26 km) |
| Waltham to Silverdale (Washington) | 2,491.48 mi (4,009.65 km) |
| Waltham to Silverton (Oregon) | 2,537.22 mi (4,083.26 km) |
| Waltham to Simi Valley (California) | 2,600.44 mi (4,185.01 km) |
| Waltham to Simpsonville (South Carolina) | 795.18 mi (1,279.72 km) |
| Waltham to Sioux City (Iowa) | 1,277.52 mi (2,055.97 km) |
| Waltham to Sioux Falls (South Dakota) | 1,286.14 mi (2,069.84 km) |
| Waltham to Skokie (Illinois) | 843.29 mi (1,357.14 km) |
| Waltham to Sleepy Hollow (New York) | 162.45 mi (261.43 km) |
| Waltham to Slidell (Louisiana) | 1,322.91 mi (2,129.02 km) |
| Waltham to Smithfield (North Carolina) | 609.04 mi (980.15 km) |
| Waltham to Smithfield (Utah) | 2,060.46 mi (3,315.99 km) |
