O'Fallon, Illinois

O'Fallon, Illinois
The Illinois Central Railroad Downtown Caboose
The Illinois Central Railroad Downtown Caboose
Flag of O'Fallon, Illinois
Official seal of O'Fallon, Illinois
Official logo of O'Fallon, Illinois
Nickname: 
"O-Town"
Location of O'Fallon in St. Clair County, Illinois.
Location of O'Fallon in St. Clair County, Illinois.
Coordinates: 38°35′46″N 89°54′56″W / 38.59611°N 89.91551°W / 38.59611; -89.91551
Country United States
State Illinois
CountySt. Clair
TownshipO'Fallon
Government
 • TypeHome rule[1]
 • MayorHerb Roach
Area
 • Total15.71 sq mi (40.67 km2)
 • Land15.59 sq mi (40.39 km2)
 • Water0.11 sq mi (0.29 km2)
Elevation541 ft (165 m)
Population
 (2020)
 • Total32,289
 • Density2,070.60/sq mi (799.48/km2)
Time zoneUTC−6 (CST)
 • Summer (DST)UTC−5 (CDT)
ZIP code(s)
62269
Area code618
FIPS code17-55249
GNIS feature ID2395302[3]
Wikimedia CommonsO'Fallon, Illinois
Websiteofallon.org

O'Fallon is a city in St. Clair County, Illinois, United States. The 2020 census listed the population at 32,289. The city is the second largest city in the Metro East region of the St. Louis metropolitan area and Southern Illinois. It sits 5 miles (8.0 km) from Scott Air Force Base and 18 miles (29 km) from Downtown St. Louis.

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.

  1. ^ "Form of Government City of O'Fallon". City of O'Fallon, IL. Retrieved December 13, 2019.
  2. ^ "2020 U.S. Gazetteer Files". United States Census Bureau. Retrieved March 15, 2022.
  3. ^ a b U.S. Geological Survey Geographic Names Information System: O'Fallon, Illinois