Dedicated on September 29, 1979 by the Most Reverend Walter W. Curtis Bishop of Bridgeport Diocese the Parish  of Saint  Elizabeth  Seton  was  founded on  May 29, 1976  when Bishop Walter W. Curtis, second Bishop of Bridgeport Diocese, commissioned Father Francis J. Medynski to form a new congregation in the Ridgebury district of Ridgefield Connecticut. Some three years earlier, the Bishop  had been considering dividing St Mary's Parish, Ridgefield.  A census showed about 800 parishioners interested in a parish in the Ridgebury district.

St. Mary's Parish in Ridgefield purchased a small ranch style house on Regan Road.  Volunteers cleaned, decorated, and donated furnishings for the rectory that contained a chapel, kitchen, bedroom, and a small room for Religious Education. The chapel altar was also the conference table for the newly formed Parish Council as well as other committees.

Plans for the new parish church began almost immediately.  A site committee was formed and held meetings weekly, searching for a suitable site for the church. After many months, the property on Ridgebury Road was located, and purchased by St. Mary's Parish.  Volunteers cleared the land and hauled brush to the town dump.