The population development of O'Fallon as well as related information and services (weather, Wikipedia, Google, images).
Source: U.S. Census Bureau (web).
Explanation: Latest available rebased population figures are used. In case of significant changes, they were recalculated by using census block data.
Further information about the population structure:
|Gender (C 2010)|
|Age Groups (C 2010)|
|Age Distribution (C 2010)|
|»Race« (C 2020)|
|2 or more||6,232|
|Ethnicity (C 2020)|
|Hispanic or Latino||3,639|