It is located off Northern Boulevard at 51 Clapham Avenue, Manhasset, near the Miracle Mile.

St. Mary's Men's Varsity Ice Hockey is the all-time leader in New York State Championships, winning consecutive titles between 1994 & 2006.

The Girls Varsity Basketball team won consecutive New York State Championship titles in 2021-2022 and 2022-2023.

[3] Personal devices are not allowed including phones, media players, and computers.

In September 2021, the school staff includes several members of the Dominican Sisters of Mary, Mother of the Eucharist.