Sierraville, Sierra County, California
Signal Hill, Los Angeles County, California
Silver Hill, Prince George's County, Maryland
Silver Lakes, San Bernardino County, California
Silver Spring, Montgomery County, Maryland
Silverado Resort, Napa County, California
Simi Valley, Ventura County, California
Sisquoc, Santa Barbara County, California
Skokie, Cook County, Illinois
Sky Lake, Orange County, Florida
Sky Valley, Riverside County, California
Skykomish, King County, Washington
Sleepy Hollow, Westchester County, New York
Smartsville, Yuba County, California
Smith Corner, Kern County, California
Smith River, Del Norte County, California
Smithtown, Suffolk County, New York
Snelling, Merced County, California
Snellville, Gwinnett County, Georgia
Snoqualmie, King County, Washington
Soda Bay, Lake County, California
Solana Beach, San Diego County, California
Soledad, Monterey County, California
Solon, Cuyahoga County, Ohio