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St. Charles County, Missouri locator map According to the United States Census Bureau, O Fallon is a City that is located in St. Charles County, Missouri at 38.81 degrees North and 90.70 degrees West.  The city's time zone is America/Chicago, and the city's primary telephone area code is 636.  The land area of O Fallon is about 29.69 square miles, whereas the water area of the city is about 0.00 square miles. 

The Census Bureau estimates that O Fallon had about 84,009 residents in 2014, which is approximately 2,830 people per square mile of land area. 

The Missouri counties map at upper right shows St. Charles 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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