Like its namesake in St. Charles County, Missouri, O'Fallon is part of the St. Louis metro area.

This makes O'Fallon (along with the two Troys in Illinois and Missouri) one of the few pairs of like-named municipalities to be part of the same metro region.

A post office was established the following year and the city began attracting German settlers looking for fertile farming land.

O'Fallon Township High School's main campus at 600 South Smiley Street has undergone numerous additions over the past decades to ease overcrowding, including the creation of the separate 9th Grade Milburn Campus.

In May 1975, the design was finalized by Louis Bradshaw and was then adopted by the city as its official flag.

The pick and shovel represent the coal mines that were so important to O'Fallon's economy for over 100 years.

The planes represent Scott Air Force Base where many in O'Fallon find employment—both military and civil service.

O'Fallon Parks and Recreation Library Registered historic places Private schools