O'Fallon is a city located in St. Clair County, Illinois, US. It was incorporated in 1905 and has since grown to become the third-largest city in the Metro East region of Illinois. The city is known for its family-friendly atmosphere and quality schools. A notable attraction in O'Fallon is the Katy Trail, the longest continuous rail-trail in the country, which attracts cyclists, hikers, and nature enthusiasts from all over.
Sam's Club takes the top spot among Warehouse Clubs in O Fallon, Illinois with 1 locations as of April 26, 2024.