The smart Trick of O'fallon Il That Nobody is DiscussingTable of ContentsSome Of O'fallon IlSome Of O'fallon LocationThe Best Guide To O'fallonO'fallon Il - An OverviewO'Fallon is a city in St. Clair Area, Illinois, which was established in 1854. O'Fallon's namesake originates from Colonel John O'Fallon, that was a rich gentleman from St. Louis. Th