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The Greatest Guide To O'fallon WeatherTable of ContentsThe Ultimate Guide To O'fallon AttractionThe Facts About O'fallon Il UncoveredThings about O'fallon IlNot known Incorrect Statements About O'fallon Attraction O'Fallon is a city in St. Clair Area, Illinois, which was founded in 1854. O'Fallon's namesake comes from Colonel John O'Fallon, who was