Our beautiful parish has a 155 year history here in O’Fallon! I invite you to join us, as a visitor or as a member of our loving parish family, as we continue that history of striving to follow Christ. I hope this website can answer your immediate questions, but you are always welcome to contact us personally, or better yet, to stop in for a visit to find Christ here... and bring Christ to the world.
Peace, Fr. Nick
Saturday Vigil: 5pm Sunday: 8am, 10am, 12-Noon, 5:30pm Monday-Friday: 6:30am, 8am & Saturday: 8am
Holy Day’s Vigil for Feast: 5:30pm Feast Day: 6:30am, 8am and 7pm
Advent By Candlelight Reservations Women of the parish! It’s almost that time again to set aside the hustle and bustle of the holidays, and focus your mind...
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TRAFFIC ALERT The O’Fallon Main Street Phase 3 project begins Monday, October 19, and will last approximately 9 months. Traffic will be down to one lane i...
Dining for Dollars: Texas Roadhouse, October 21 from 4:00 - 8:00pm. 10% given back to Assumption PTO!
Remember to vote ‘YES’ for Amendment 3 on November 3, 2026! On November 3, voters will get the opportunity to restore pro-life values back into the Missour...
Thank you for making the Assumption Fall Festival such a wonderful two-day celebration! ❤️ We are deeply grateful to everyone who joined us over the weekend and helped...
The That Man Is You (TMIY) Saturday fall program begins September 12–December 12, and offers men spiritual growth through sessions on faith, church history, sa...