1854Government
== History ==
Founded in 1854, O'Fallon's namesake comes from Colonel John O'Fallon who was a wealthy gentleman from St.
1874Government
On January 27, 1874, O'Fallon was incorporated as a village.
1905Civil Rights
On March 14, 1905, the citizens voted for a change to the city form of government.
1974History
O'Fallon's city seal was designed in 1974 by Michael Donovan, an OTHS freshman, during a contest held by the O'Fallon Junior Woman's Club to create a city flag.
1975History
In May 1975, the design was finalized by Louis Bradshaw and was then adopted by the city as its official flag.
2004History
According to the 2004 publication by the O'Fallon Historical Society, O'Fallon Sesquicentennial History: "The design is yellow gold on a blue background—the colors of the high s...
2006Disaster
The planes represent Scott Air Force Base where many in O'Fallon find employment—both military and civil service."
=== Events ===
Tornado outbreak of April 2, 2006
== Geogra...
2020History
== Demographics ==
As of the census of 2020, there were 32,289 people, 12,093 households, and 7,114 families living in the city.