| Katy to Silver Firs (Washington) | 1,871.43 mi (3,011.78 km) |
| Katy to Silver Spring (Maryland) | 1,243.56 mi (2,001.32 km) |
| Katy to Silver Springs Shores (Florida) | 832.32 mi (1,339.49 km) |
| Katy to Silverdale (Washington) | 1,885.30 mi (3,034.09 km) |
| Katy to Silverton (Oregon) | 1,800.50 mi (2,897.62 km) |
| Katy to Simi Valley (California) | 1,374.16 mi (2,211.50 km) |
| Katy to Simpsonville (South Carolina) | 862.63 mi (1,388.27 km) |
| Katy to Sioux City (Iowa) | 878.40 mi (1,413.64 km) |
| Katy to Sioux Falls (South Dakota) | 951.25 mi (1,530.89 km) |
| Katy to Skokie (Illinois) | 958.61 mi (1,542.74 km) |
| Katy to Sleepy Hollow (New York) | 1,455.85 mi (2,342.97 km) |
| Katy to Slidell (Louisiana) | 363.60 mi (585.17 km) |
| Katy to Smithfield (North Carolina) | 1,089.41 mi (1,753.23 km) |
| Katy to Smithfield (Utah) | 1,218.99 mi (1,961.78 km) |
| Katy to Smithville (Missouri) | 667.23 mi (1,073.81 km) |
