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The Single Strategy To Use For O'fallon WeatherTable of ContentsUnknown Facts About O'fallon LocationRumored Buzz on O'fallon HourNot known Facts About O'fallon Weather4 Simple Techniques For O'fallon AddressO'Fallon is a city in St. Clair County, Illinois, which was started in 1854. O'Fallon's namesake originates from Colonel John O'Fallon, who wa