Stemming from connections to Christian Brothers at the LaSalle Institute in the township of Glencoe (now Wildwood), the Sacred Heart parish was formally founded in 1889. "Harmony, charity and love for the Eucharist" is the parish's motto.
Sacred Heart Athletic Association parishioners volunteer as coaches for the church's basketball and volleyball teams. Other activities include a gardening club and quilting group.
The parish has operated a parochial school since 1948. For children who attend public schools, this church offers a Parish School of Religion (PSR).
Saint Barnabas Church on North Main Street is a parish celebrating fifty years as a place of worship and faith in O'Fallon. Holy Mass is held Saturday evenings at 5pm and Sunday at 8am and 11am. Church events include a regular pancake breakfast and adult faith classes, both of which are welcome to all. The church publishes a regular newsletter with news, prayer messages and a calendar of events.
Holy Redeemer Catholic Church was founded in 1826. Father Kenneth Brown conducts daily mass and has a large selection of activities and missions events. Some of the activities include a youth soccer program, mission trip to Haiti, local missions, retreats, picnics and more.
St. Paul Catholic Church is a large parish with a full range of facilities and organizations, including an elementary school, men's club, St. Anne's Sodality, mother's club, Catholic Women of Faith, a youth ministry and an active athletic association. There are several choirs. The first Mass at St. Paul's was celebrated on Christmas Day 1879. The first church was a white frame building. The first brick church was constructed in Olde Town Fenton on Main Street. It still stands today. As the congregation grew, a bigger facility was needed and a church/school building was built in 1959 on the site of a former orphanage on Smizer Mill Road. The current church was dedicated on Nov. 4, 1984, allowing the school to expand into the old church building.
St. Martin de Porres Parish is a member of the Catholic Church of St. Louis. Its focus is to reach out to those in the community. Longstanding in the Hazelwood communty, St. Martin's fufils the need for private educational excellence through its elementary and middle school institution, St. Ferdinand.
Mary Mother of the Church is a Catholic church on Kerth Road in South County. Mass is held daily, with three services on Sunday and a Sunday school for pre-schoolers. The church operates a parish school of religion for children in grades 1 through 8 on Mondays and Wednesdays. There are numerous prayer groups associated with the church, including a cancer care and support group.
Annunziata Catholic Church is part of the Archdiocese of St. Louis. The pastor of the church is Monsignor John Leykam.
Regular prayer service is held at Annunziata and the church operates numerous community outreach programs including a food collection and participation in the local Habitat for Humanity organization.
Annunziata operates its Parish School of Religion, which provides religious instruction for Annunziata parishioners grades pre K-8.
