In 1866, two Sinsinawa Dominican sisters arrived to begin a school. A third teaching sister arrived in 1880, and in 1888 a music teacher joined the staff. By 1911, 196 students were being taught by four teachers in four classrooms.
By 1945, the enrollment had grown to 215. To accommodate this growth, the old German Catholic church building was renovated to include seventh and eighth grade classrooms and an auditorium.
Three years later, a nearby house was converted into classrooms and a building fund was begun. By 1953, when Father Thome arrived, more than $100,000 had been collected.
Father Thome appointed finance and building committees. After another financial drive brought the building fund to $200,000, plans for a new school were drawn up. Ground was broken in October of 1955, and a new $650,000 school was dedicated one year later.
The building, which was ultra-modern for its time, contained a gymnasium/auditorium with a seating capacity of 900, two locker rooms, a kitchen, a cafeteria, ten classrooms, two large meeting rooms, a parish library, a nurse’s office, and an administrative office. At that time, seven Sinsinawa Dominicans and two lay teachers taught 375 students.
Between 1946 and 1956, a large increase in enrollments within the Diocese led to a shortage of religious staff at the schools. Ten new schools were built, and lay faculty increased from 2 to 44.
Over the years, the parish has remained committed to maintaining a school and building on its tradition of excellence. In the mid 1970’s, a certified physical education teacher was added to the staff. In 1982, a kindergarten was started. An art teacher and computer teacher were added to the staff in 1991. By 1992, St. Mary School was staffed entirely by a lay faculty.
Agents of change have been at work in the parish from the beginning. Parishioners have been willing to convert existing space to accommodate more students, to build a new facility, to hire an all lay staff, and to add new programs to maintain the excellent reputation of the school.
As the school entered the new millennium, the parish recognized the need to modernize the 1956 facility to meet 21st-century educational and safety standards. The "Foundations for Our Future" capital campaign was launched, eventually raising over $3 million to transform the campus.