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The 30-Second Trick For O'fallon Zip CodeTable of ContentsSome Ideas on O'fallon Zip Code You Should KnowAll About O'fallon IlO'fallon Hour - An OverviewHow O'fallon Address can Save You Time, Stress, and Money.O'Fallon is a city in St. Clair County, Illinois, which was established in 1854. O'Fallon's name originates from Colonel John O'Fallon, tha