8 Simple Techniques For O'fallon AddressTable of ContentsFascination About O'fallon HourThe Facts About O'fallon Hour RevealedThe Ultimate Guide To O'fallon ParkingThe Single Strategy To Use For O'fallon WeatherO'Fallon is a city in St. Clair Region, Illinois, which was established in 1854. O'Fallon's namesake originates from Colonel John O'Fallon,