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O'fallon Weather for DummiesTable of ContentsO'fallon Hour Can Be Fun For AnyoneLittle Known Facts About O'fallon Parking.Some Known Details About O'fallon Il 6 Easy Facts About O'fallon DescribedO'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 fr