The Jefferson Market Branch, New York Public Library, once known as the Jefferson Market Courthouse, is located at 425 Avenue of the Americas (Sixth Avenue), on the southwest corner of West 10th Street, in Greenwich Village, Manhattan, New York City, on a triangular plot formed by Greenwich Avenue and West 10th Street. It was originally built as the Third Judicial District Courthouse from 1874 to 1877, and was designed by architect Frederick Clarke Withers of the firm of Vaux and Withers.