Waccabuc is a hamlet and lake in Lewisboro, Westchester County, New York. It was first established as a vacation home for the Mead family, for whom the core road of the hamlet, Mead Street, is named. It is mostly known for its lake, Lake Waccabuc, for which the hamlet was named, if it is ever known at all. The Mead family vacation house in Waccabuc has since become the privately owned Waccabuc Country Club, which owns two large stretches of golf-fields and a lake-front. For many years, it held the record for smallest post office in the United States, until an expansion in 2003 cost it that distinction.