Adelphi University is a private university located in Garden City, New York. It is the oldest institution of higher education on Long Island. Adelphi is home to a total of 8,600 students: 5,100 undergraduates and 3,500 graduate students. The campus of Adelphi University is located on 75 acres of suburban land in Nassau County, New York. Students participate in over 70 clubs and organizations, as well as in NCAA DII sports.