This City Has the Oldest Church in Entire Illinois

Illinois is home to the Church of the Holy Family in Cahokia Heights, which holds the distinction of being the oldest church in the United States. This church is a testament to the rich history and culture of the state. This incredible structure is not only a stunning example of architecture, but also serves as a powerful symbol of the unyielding devotion of its worshippers. In this blog post, we’ll explore the rich history, unique characteristics, and deep significance of this esteemed church.

The Church’s Journey Through History

The Church of the Holy Family was founded in 1699 by Canadian missionaries and started as a modest wooden structure. Regrettably, a devastating fire destroyed it in 1783. The current church was built between 1786 and 1799 and features French colonial architecture using the “poteaux-sur-solle” technique. This method utilizes the placement of sturdy wooden timbers on a solid stone foundation, with the gaps being filled using a combination of rubble and clay. This is a rare find in North America and holds the title of being the oldest example west of the Allegheny Mountains.

The church has witnessed significant events throughout history, including the transfer of the Louisiana Territory to the U.S. in 1803, the Civil War, and the Great Flood of 1993. It has been a hub for community life, hosting a variety of ceremonies and events. The church has managed to preserve its original character, which has led to its recognition as a National Historic Landmark and inclusion in the National Register of Historic Places in 1970, even after undergoing renovations.

Unique Characteristics of the Church

The Church of the Holy Family showcases a simple yet elegant design, with dimensions of around 32 by 74 feet. The exterior walls are made of walnut timbers, while the interior features plastered and whitewashed walls, wooden plank floors, and oak beam supports for the ceiling. The church is designed with a nave, sanctuary, and two wings, creating a space that is both straightforward and meaningful for worship.

The church houses several significant artifacts, such as a painting of the Holy Family, which is the oldest in Illinois. Additionally, there is a statue of Saint Anthony of Padua, carved by a Native American convert, which holds the title of being the oldest statue in the state. Lastly, there is a relic of Saint Valentine, generously donated by Pope Pius IX in 1866. This relic is particularly special as it is the only one of its kind in the United States. The church’s cemetery, adorned with graves that have stood the test of time since the 18th century, brings a peaceful element to its rich history.

Also Read: Exploring the Oldest Church in Entire Texas

The Profound Significance

The Church of the Holy Family represents more than just a building; it symbolizes the deep faith, rich heritage, and unwavering strength of its members. With a rich history as the oldest continuously active Catholic parish in the U.S., it has always embraced a diverse congregation. This includes descendants of French settlers, Native Americans, African Americans, and immigrants. The commitment to preserving Catholic traditions is evident through its ties with the Institute of Christ the King Sovereign Priest.

The church serves as a hub of culture and history, displaying the impact of French colonialism and adding to the significance of the Cahokia Mounds State Historic Site. Additionally, it is located in close proximity to the Lewis and Clark State Historic Site, which adds to its significance as a dynamic museum that showcases the rich history of Illinois and the United States.


The Church of the Holy Family is a hidden gem in Illinois that is worth visiting for history, architecture, and religion enthusiasts. Being the oldest church in the U.S., it serves as a distinctive example of French colonial architecture. The church continues to flourish as a vibrant parish, embracing its rich heritage. Available for tours, Masses, and events, this place welcomes everyone to discover its rich history, unique features, and lasting importance. It is truly a cherished landmark in Illinois and a symbol of the holy family.

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