The school was affiliated with its parent parish, St. Mary's Church, and operated under the auspices of the Roman Catholic Archdiocese of Newark.

[6] Efforts to raise $2 million to pay off the debt and to keep the doors open fell far short of the fundraising goals and the school officially closed on August 30, 2019.

[7] The St. Mary of the Assumption High School Hilltoppers[3] competed in the Union County Interscholastic Athletic Conference, which included public and private high schools in Union County and operates under the supervision of the New Jersey State Interscholastic Athletic Association (NJSIAA).

[12] The 1954 team defeated St. Joseph's of Camden by a score of 54–37 in the Catholic Class B final at the Elizabeth Armory.

[15] The 1983 team finished the season with a 15–9 record after winning the Group B state title with a 5–1 victory against Gloucester Catholic in the championship game.