403 N. Main St.
O'Fallon, MO 63366-2205
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Assumption (O'Fallon)

The words of our mission, “May you find Christ here…May you bring Christ to the world,” are literally written in stone; built into the front side of the new church building. To hold ourselves accountable to this mission, to ensure this is a place of unconditional welcome, and to fill our parish with love, we commit ourselves to these 8 statements: • I will help create an environment where all are welcome • I will respect the wisdom of long-time parishioners and welcome the gifts of the new • I will bring my concerns to the correct person and in a respectful way • I will encourage people to be their best but I will not expect perfection from them • I will participate at Sunday Mass each week and pray regularly • If I hurt anyone, I will apologize, and if I am hurt will offer forgiveness • I will contribute my time, talent, and treasure for the good of others • I will treat each person as I would treat Jesus
Founded: 1871
Deanery: St. Charles Deanery
Contacts
Very Reverend Nicholas Kastenholz J.C.L., V.F. - Pastor
Reverend Monsignor William McCumber - Senior Associate Pastor
Reverend Patrick Russell - In Residence
Deacon Richard Tadlock - Permanent Deacon
Deacon Fred Volansky - Permanent Deacon
Mr. Robert Hennekes - Permanent Deacon

Learn More

Mass Times
  • Sunday
    • 8:00 am / 10:00 am / 12:00 pm / 5:30 pm
  • Saturday
    • 8:00 am
  • Saturday (Vigil)
    • 5:00 pm
  • Monday
    • 6:30 am / 8:00 am
  • Tuesday
    • 6:30 am / 8:00 am
  • Wednesday
    • 6:30 am / 8:00 am
  • Thursday
    • 6:30 am / 8:00 am
  • Friday
    • 6:30 am / 8:00 am
  • Holy Days
    • 6:30 am / 8:00 am / 7:00 pm
  • Holy Days (Vigil)
    • 5:30 pm
Reconciliation Times
  • Saturday
    • 4:00 pm - 4:45 pm
  • Monday
    • 7:30 am - 8:00 am
  • Tuesday
    • 7:30 am - 8:00 am
  • Wednesday
    • 7:30 am - 8:00 am
  • Thursday
    • 7:30 am - 8:00 am
  • Friday
    • 7:30 am - 8:00 am
Eucharistic Adoration Times
  • Tuesday
    • 8:30 am - 6:30 pm

Share Walk for Remembrance & Hope

Assumption (O'Fallon) | July 11 2022

Share Pregnancy and Infant Loss Support is hosting the 21st Annual Walk for Remembrance & Hope on Saturday, October 15, 2022. The annual event at Frontier Park in St. Charles, MO provides families who have experienced the death of their baby an opportunity to openly acknowledge and remember. It allows families to walk the steps their precious children will never get to take. Families are welcome to bring flowers to place at the base of the Baby Memorial Wall where babies’ names will be printed. Day-of Schedule 8:00 a.m. Day-Of Registration Opens 9:00 a.m. Creation Station Opens 10:00 a.m. Memorial Service 11:00 a.m. Walk Begins 11:30 a.m. BBQ Picnic Lunch Hamburger and hot dog barbecue lunches can be purchased on the registration form. You will have the option to buy lunch on-site, but we encourage pre-ordering to guarantee availability. Virtual Walker: Unable to attend? Gather your friends and family to walk virtually!


Mass in Memory of Our Children

Assumption (O'Fallon) | November 01 2021

The Annual Mass in Memory of Our Children will be celebrated on Sunday, December 5, 2021 at 2 p.m. at the Old Cathedral, 209 Walnut St, Downtown St. Louis. Fr. Mitch Doyen will be the celebrant. This Mass is an annual tradition that provides families who have lost a child with a way to include them in their Christmas celebrations. All are welcome. For more information, please contact Cindy Swain at (314)313-1701.