Welcome to St. Mary's School

School will be closed March 13th through April 5th per state and Archdiocesan mandate

As of now, classes will resume on Monday, April 6th

Welcome to St. Mary’s Catholic School, where we have maintained a tradition of Catholic education for over 110 years! We are pleased to support families in the education of their children as they seek solid academics and a firm moral and spiritual grounding in the Catholic Faith.

St. Mary's Mission Statement

The Mission of St Mary’s School is to encounter Christ each day through the teachings of the Catholic faith while learning and growing in a Montessori culture.

Unfortunately, our school will be closing at the end of the 2019/2020 school year.  Thank you for your support and prayers

We are proud to be the only Catholic Montessori School in the Archdiocese of Detroit. 


Mrs. LeeAnn Brennan

My name is Mrs. LeeAnn M. Brennan and I am the principal at St. Mary’s Catholic Montessori School. I am a former teacher. I taught for fourteen years at St. Mary’s and my heart has always been connected to this school. I am excited to return home.  I am also a Montessori parent and I know the benefits of a Montessori education for your child. Please know that my door is always open to you. I know that together we can continue to enable our beautiful school to thrive and flourish.

Schedule a Visit


We'd love to meet you.  Let us answer your questions as we take you on a personal tour of our dynamic school.

Diocese Information


Our parish and school is part of the Archdiocese of Detroit.

Today's Hot Lunch


View the current months hot lunch schedule.

Need Directions?


800 Orchard Street,
St. Clair, MI 48079

(810) 329-4150



Have a question?


Give us a call at 810.329.4150 or use the form below.

Thinking about St. Mary's?


To set up a visit call 810.329.4150 or use the link below to use our online form.

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