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The Facts About O'fallon Map RevealedTable of ContentsThe Definitive Guide for O'fallon HourThe Only Guide to O'fallon WeatherA Biased View of O'fallon HourAll About O'fallon HourO'Fallon is a city in St. Clair County, Illinois, which was established in 1854. O'Fallon's namesake comes from Colonel John O'Fallon, that was a wealthy gent from St. Lou