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Some Known Details About O'fallon Weather Table of ContentsAbout O'fallon WeatherA Biased View of O'fallon Zip CodeEverything about O'fallon IlHow O'fallon Address can Save You Time, Stress, and Money.To make the many of your journey between Collinsville and O'Fallon, we advise taking the picturesque Interstate 64 West. Once you show up in O'Fallon