For over 60 years, St. Mary Immaculate Parish School strives to create a Catholic learning environment of academic excellence in which we develop in our children a deep Catholic faith emphasizing the message of Jesus and encouraging a life-long quest for knowledge, justice, and mercy. WE ARE SMI!  #SMISaysYes


15629 S. Route 59
Plainfield, IL 60544
815-436-3953 Phone
815-439-8045 Fax    



School Year 2020-2021 Information

St. Mary's is open for in-person instruction as of August 19th, per the Announcement made by the Office of the Bishop on June 16th.  


We will be following the policies of the Diocese of Joliet, who are guided by the  CDC, IDPH, WCHD, and the State of Illinois regarding safety and sanitizing. 

Please call for more information and the registration process.

Click here for the Bishop's Message

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St. Mary's is part of Amazon Smiles!

When you #StartWithaSmile, Amazon donates 0.5% of the purchase price to St. Mary Immaculate School. Bookmark the link smile.amazon.com/ch/36-2264405 and support us every time you shop.

Annual Giving

​At St. Mary Immaculate, donors make dreams possible for the students and staff.

Gifts to St. Mary Immaculate School provide us with funds for the most immediate needs of our school and to provide financial assistance to families in need.

If you would like to donate to the school, contact the school office for more details. 815-436-3953  #SMISaysYes

Voted 2017 Best Pre-School

in Will County

Voted again for a 2nd year in a row!

We are blessed once again to be chosen for our PreSchool

in 2019

© 2020 St. Mary Immaculate Parish School

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