In contrast, all of Brooklyn and Queens are served by the New York City Department of Education, the largest school district in the United States. Three of the nine specialized high schools in New York City are in the two Long Island boroughs, those being Brooklyn Latin School, Brooklyn Technical High School (one of the original three specialized schools), and Queens High School for the Sciences. Like Nassau and Suffolk counties, they are home to private schools such as Poly Prep Country Day School, Packer Collegiate Institute, and Saint Ann's School, and Berkeley Carroll School, and parochial schools operated by the Catholic Diocese of Brooklyn.