O'Fallon was founded in 1856 by Nicholas Krekel. Landmarks include CarShield Field, St. Mary's Institute of O'Fallon and KFTK-FM. O'Fallon is the birthplace of Josh Sargent, soccer player.
- CountySt. Charles County
- Population91,316 (2020 U.S. Census)
- Historic places1 on the National Register


























