O'Fallon Map
The City of O'Fallon is located in St. Charles County in the State of Missouri. Find directions to O'Fallon, browse local businesses, landmarks, get current traffic estimates, road conditions, and more. According to the 2019 US Census the O'Fallon population is estimated at 89,769 people. The O'Fallon time zone is Central Daylight Time which is 6 hours behind Coordinated Universal Time (UTC).
Nearby cities include South Shore, Kampville Beach, Gumbo, Rivers, Blanchette.