About Us

St. Mary Immaculate Parish is located in Plainfield, IL in Will County.  It is part of the Diocese of Joliet, under the direction of Bishop Daniel Conlon.

We are 8100 families strong with a multitude of ethnicities, ages and members.  We are diverse, prayerful and subscribe to our mission "One Family in Faith, Making Christ Known".

Parish Mission Statement:

We are the parish community of St. Mary Immaculate, rooted in the scriptures and the Roman Catholic tradition in the Diocese of Joliet. We are a community blessed with a growing and diverse population. We are one family in faith that works to welcome, support and care for one another. Guided by the Holy Spirit, we seek to make Christ known in worship, hearing and sharing the faith of the Church, reception of the sacraments and living daily Christ’s call to love, service, compassion, generosity and justice.


Click here to view the History of St. Mary Immaculate.


Click here for the
Parish Calendar

Online Giving

Online Giving

Secure and Convenient Donate now!