- Sleepy Hollow
- Sleepy Hollow
- Sleepy Hollow
- Sleepy Eye
- Slayton
- Slaughterville
- Slaton
- Slatington
- Slater-Marietta
- Skyline View
- Sky Valley
- Sky Lake
- Skowhegan
- Skokie
- Skippers Corner
- Skippack
- Skidway Lake
- Skidaway Island
- Skiatook
- Skaneateles
- Sixteen Mile Stand
- Sitka
- Sisters
- Sissonville
- Sisseton
- Sisco Heights
- Sioux Falls
- Sioux City
- Sioux Center
- Sinton
- Sinking Spring
- Singac
- Simsbury Center
- Simpsonville
- Simpsonville
- Simonton Lake
- Simmesport
- Simi Valley
- Silvis
- Silverton
- Silverton
- Silverthorne
- Silverdale
- Silver Springs Shores
- Silver Springs
- Silver Spring
- Silver Lake
- Silver Lake
- Silver Lake
- Silver Lake
- Silver Hill
- Silver Firs
- Silver Creek
- Silver City
- Silt
- Silsbee
- Siloam Springs
- Siletz
- Siler City
- Sikeston
- Sigourney
- Signal Mountain
- Signal Hill
- Siesta Key
- Sierra Vista Southeast
- Sierra Vista
- Sierra Madre
- Sienna Plantation
- Sidney
- Sidney
- Sidney
- Sidney
- Sidney
- Sibley
- Shrub Oak
- Shrewsbury
- Shrewsbury
- Shrewsbury
- Shrewsbury
- Shrewsbury
- Shreveport
- Show Low
- Short Pump
- Short Hills
- Shorewood Forest
- Shorewood
- Shorewood
- Shorewood
- Shoreview
- Shoreline
- Shively
- Shirley
- Shiprock
- Shippensburg
- Shinnston
- Shinnecock Hills
- Shingletown
- Shingle Springs
- Shiner
- Shiloh
