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O'fallon Parking - QuestionsTable of ContentsThe Definitive Guide for O'fallon MapThe smart Trick of O'fallon Attraction That Nobody is Talking AboutThe 4-Minute Rule for O'fallon Address9 Easy Facts About O'fallon Zip Code DescribedO'Fallon is a city in St. Clair County, Illinois, which was started in 1854. O'Fallon's name originates from Colonel