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Some Known Factual Statements About O'fallon Weather Table of ContentsNot known Facts About O'fallon LocationThe Only Guide to O'fallon ParkingWhat Does O'fallon Map Do?O'fallon Weather for DummiesO'Fallon is a city in St. Clair Region, Illinois, which was started in 1854. O'Fallon's name comes from Colonel John O'Fallon, who was an affluent gent f