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 2021-2022 Information

St. Mary's is open for in-person instruction now and for the next school year.


We are 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. 

We are currently taking appointments for registration that begins on Sunday, January 31, 2021. Call for more details 815-436-3953

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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.

Prayers of Support Needed!

​We are keeping our second graders in our prayers as they prepare for the sacrament of First Communion.


They have worked hard in class, participated in a retreat, and are now making the final preparations for the big day.


Please join us in prayer for them as they approach the day the can come to the Lord's table.    #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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