O'fallon Weather Can Be Fun For EveryoneTable of Contents8 Simple Techniques For O'fallon LocationRumored Buzz on O'fallon MapSome Known Details About O'fallon Hour The Ultimate Guide To O'fallon LocationO'Fallon is a city in St. Clair Region, Illinois, which was started in 1854. O'Fallon's name originates from Colonel John O'Fallon, that was an af