Founded on October 26, 1919, it is one of the Polish-American Roman Catholic parishes in New England in the Archdiocese of Hartford.

On October 26, 1919, St. Mary Parish was created when Fr.

He celebrated the first Masses for St. Mary in St. Francis chapel.

A basement church was completed in 1921 and dedicated on October 5, 1921, by Bishop John Joseph Nilan.

St. Mary and Sacred Heart churches were advertised for sale in January 2019.