Bishop McGann-Mercy Diocesan High School (formerly Mercy High School) was a Roman Catholic high school in Riverhead, New York on Long Island. It was operated by the Roman Catholic Diocese of Rockville Centre. The Diocese closed the school in 2018.
Bishop McGann-Mercy Diocesan High School (formerly Mercy High School) was a Roman Catholic high school in Riverhead, New York on Long Island. It was operated by the Roman Catholic Diocese of Rockville Centre. The Diocese closed the school in 2018. (en)