| Boston to Silver Firs (Washington) | 4,687.39 mi (7,543.63 km) |
| Boston to Silver Spring (Maryland) | 3,632.54 mi (5,846.01 km) |
| Boston to Silver Springs Shores (Florida) | 4,318.53 mi (6,950.01 km) |
| Boston to Silverdale (Washington) | 4,712.36 mi (7,583.81 km) |
| Boston to Silverton (Oregon) | 4,869.59 mi (7,836.85 km) |
| Boston to Simi Valley (California) | 5,379.56 mi (8,657.56 km) |
| Boston to Simpsonville (South Carolina) | 4,045.75 mi (6,511.00 km) |
| Boston to Sioux City (Iowa) | 4,190.83 mi (6,744.49 km) |
| Boston to Sioux Falls (South Dakota) | 4,150.38 mi (6,679.39 km) |
| Boston to Skokie (Illinois) | 3,901.64 mi (6,279.09 km) |
| Boston to Sleepy Hollow (New York) | 3,412.12 mi (5,491.28 km) |
| Boston to Slidell (Louisiana) | 4,568.44 mi (7,352.19 km) |
| Boston to Smithfield (North Carolina) | 3,851.38 mi (6,198.19 km) |
| Boston to Smithfield (Utah) | 4,735.70 mi (7,621.38 km) |
| Boston to Smithville (Missouri) | 4,282.70 mi (6,892.34 km) |
