| San Marino to Silver Firs (Washington) | 972.11 mi (1,564.46 km) |
| San Marino to Silver Spring (Maryland) | 2,285.74 mi (3,678.55 km) |
| San Marino to Silver Springs Shores (Florida) | 2,140.72 mi (3,445.15 km) |
| San Marino to Silverdale (Washington) | 965.29 mi (1,553.49 km) |
| San Marino to Silverton (Oregon) | 791.45 mi (1,273.72 km) |
| San Marino to Simi Valley (California) | 37.67 mi (60.63 km) |
| San Marino to Simpsonville (South Carolina) | 2,033.01 mi (3,271.82 km) |
| San Marino to Sioux City (Iowa) | 1,307.00 mi (2,103.42 km) |
| San Marino to Sioux Falls (South Dakota) | 1,316.42 mi (2,118.58 km) |
| San Marino to Skokie (Illinois) | 1,729.39 mi (2,783.19 km) |
| San Marino to Sleepy Hollow (New York) | 2,442.13 mi (3,930.24 km) |
| San Marino to Slidell (Louisiana) | 1,671.83 mi (2,690.56 km) |
| San Marino to Smithfield (North Carolina) | 2,242.25 mi (3,608.55 km) |
| San Marino to Smithfield (Utah) | 632.97 mi (1,018.66 km) |
| San Marino to Smithville (Missouri) | 1,348.53 mi (2,170.25 km) |
