Catholic Parishes in O Fallon

Looking for a Catholic church near you in O Fallon? Browse every Catholic parish in O Fallon, Illinoiswith Sunday Mass times, weekday Mass schedules, confession (reconciliation) availability, and contact info. The interactive map shows each parish location so you can quickly find the closest Catholic church; the filter bar lets you narrow by Mass day, language, or confession availability — whether you're looking for an early-morning Sunday Mass, a Saturday vigil, or a Spanish-speaking parish.