St. James is a hamlet and census-designated place (CDP) in Suffolk County, New York, United States. The population of the CDP was 13,338 at the 2010 census. St. James is part of the Town of Smithtown and is located on the North Shore of Long Island. The ZIP code is 11780.
In the early 20th century, St. James was a popular vacation spot for glitterati of the stage and screen. Summer residents included Lionel, Ethel, and John Barrymore, Buster Keaton, Myrna Loy, and Irving Berlin, among others. Noteworthy persons of the hamlet have included Stanford White, architect; William Jay Gaynor, New York State Supreme Court Justice and Mayor of New York City; Mick Foley, professional wrestler; Soledad O'Brien, television personality; John Miceli, drummer for Meat Loaf; and John Petrucci, lead guitar player for Dream Theater.