| Duluth to Silver Firs (Washington) | 1,398.80 mi (2,251.16 km) |
| Duluth to Silver Spring (Maryland) | 932.40 mi (1,500.55 km) |
| Duluth to Silver Springs Shores (Florida) | 1,336.62 mi (2,151.08 km) |
| Duluth to Silverdale (Washington) | 1,425.31 mi (2,293.82 km) |
| Duluth to Silverton (Oregon) | 1,469.32 mi (2,364.64 km) |
| Duluth to Simi Valley (California) | 1,631.12 mi (2,625.03 km) |
| Duluth to Simpsonville (South Carolina) | 978.21 mi (1,574.28 km) |
| Duluth to Sioux City (Iowa) | 361.98 mi (582.54 km) |
| Duluth to Sioux Falls (South Dakota) | 316.19 mi (508.85 km) |
| Duluth to Skokie (Illinois) | 392.78 mi (632.12 km) |
| Duluth to Sleepy Hollow (New York) | 987.06 mi (1,588.52 km) |
| Duluth to Slidell (Louisiana) | 1,146.09 mi (1,844.45 km) |
| Duluth to Smithfield (North Carolina) | 1,055.35 mi (1,698.43 km) |
| Duluth to Smithfield (Utah) | 1,028.24 mi (1,654.79 km) |
| Duluth to Smithville (Missouri) | 524.68 mi (844.40 km) |
