O'Fallon is a city in St. Clair County, Illinois, United States, and one of the fastest-growing communities in the Metropolitan St. Louis area. A 2017 special census listed the city's population at 30,440. The city is the second largest city in the Metro-East region and Southern Illinois. Due to its close proximity to Scott Air Force Base, the population receives a boost from military and federal civilian personnel, defense contractors, and military retirees.
The city center is located approximately two miles east of the intersection of Interstate 64 and U.S. Route 50.
Like its namesake in St. Charles County, Missouri, O'Fallon is part of the St. Louis Metropolitan Statistical Area. This makes O'Fallon (along with the two Troys in Illinois and Missouri) one of the few pairs of like-named municipalities to be part of the same MSA.
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It is in a very nice and quiet environment there are even near by assistant living and nursing homes as well as nice schools with great academics