From the beginning, this school was a satellite campus of St. Joseph College Wellesley for its purpose to teach younger women secretarial skills.

The namesake, Francis Marrocco was a Toronto Auxiliary Bishop of Italian descent who worked with Archbishop Pocock in the Archdiocese of Toronto's great efforts in the 1960s to extend the availability of Roman Catholic secondary education and was known for helping immigrants adjust to their new life in Canada.

[4] The school has a diverse community of Portuguese, Central American, Ukrainian, Polish, Lithuanian and Filipino descent.

[1] It offers a diverse curriculum for students who want to pursue post-secondary education, apprenticeships and trades and gain skills for the world of work.

[5][1] As an inner city high school, Marrocco-Merton's facility was built in 1968 as West Park Vocational School, designed by Abram and Ingleson Architects as a four-storey high school features a double gymnasium, a tailoring shop, a chapel, an olympic-size swimming pool, a 700-seat amphitheatre-style auditorium, and a football/soccer field on top of a parking garage.