Not known Facts About O'fallon Zip Code Table of ContentsAll About O'fallon WeatherMore About O'fallon ParkingSome Known Facts About O'fallon Weather.The Only Guide to O'fallon WeatherO'Fallon is a city in St. Clair Area, Illinois, which was founded in 1854. O'Fallon's name comes from Colonel John O'Fallon, that was a wealthy gentleman from St. Lo

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