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Getting The O'fallon Address To WorkTable of ContentsRumored Buzz on O'fallon Weather6 Easy Facts About O'fallon Map ShownThe Best Guide To O'fallonFacts About O'fallon Location RevealedO'Fallon is a city in St. Clair County, Illinois, which was established in 1854. O'Fallon's namesake comes from Colonel John O'Fallon, who was a rich gent from St.