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Rumored Buzz on O'fallon ParkingTable of ContentsThe Of O'fallonSome Known Questions About O'fallon Attraction.O'fallon Address Fundamentals ExplainedAn Unbiased View of O'fallon Zip CodeO'Fallon is a city in St. Clair County, Illinois, which was established in 1854. O'Fallon's name comes from Colonel John O'Fallon, that was a well-off gent from St