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St. Clair County, Illinois locator map According to the United States Census Bureau, O Fallon is a City that is located in St. Clair County, Illinois at 38.59 degrees North and 89.91 degrees West.  The city's time zone is America/Chicago, and the city's primary telephone area code is 618.  The land area of O Fallon is about 14.86 square miles, whereas the water area of the city is about 0.12 square miles. 

The Census Bureau estimates that O Fallon had about 29,069 residents in 2014, which is approximately 1,956 people per square mile of land area. 

The Illinois counties map at upper right shows St. Clair County, highlighted in red.  Use the menu below to display interactive maps of O Fallon, either in a frame on this page or in full-screen mode. 

Use the menu below to display categorized O Fallon directories. 

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