O'Fallon, Illinois, is a city located in St. Clair County, just east of the Mississippi River and about 15 miles from downtown St. Louis. It is part of the Metro East region and has a population of approximately 30,000 residents. The city is known for its family-friendly atmosphere, parks, and recreational facilities. Founded in the early 19th century, O'Fallon has grown rapidly in recent years, attracting new businesses and families. The city offers a variety of amenities, including shopping centers, schools, and community events. O'Fallon is also home to several annual festivals that celebrate local culture and community spirit.