Locust Valley is a hamlet and census-designated place (CDP) located in Nassau County, New York. Locust Valley is an unincorporated area of the Town of Oyster Bay. As of the United States 2010 Census, the CDP population was 3,406. Locust Valley is one of the wealthiest suburbs of New York City. Also, one of the wealthiest towns in the east and in the nation. The town is commonly identified with its W.A.S.P and "White Shoe" culture surrounding a group of polo and golf clubs, primarily the secretive Piping Rock Club, as well as the equally prestigious Creek Club.