The Facts About O'fallon Map Revealed Table of ContentsThe Of O'fallon AttractionThe O'fallon Map DiariesThe Ultimate Guide To O'fallon ParkingO'fallon Map - TruthsO'Fallon is a city in St. Clair Area, Illinois, which was started in 1854. O'Fallon's name originates from Colonel John O'Fallon, who was a well-off gentleman from St. Louis. This city'