O Fallon, Missouri Map and Directory
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.
Nearby Missouri Cities and Towns *
* Parenthesized numbers indicate economic activity levels.
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