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O'Fallon

city in St. Clair County, Illinois, United States

Key facts

Country: United States
State: Illinois
County: St. Clair
Township: O'Fallon
Type: Home rule
Total: 15.70 sq mi (40.67 km )
Land: 15.59 sq mi (40.39 km )
Water: 0.11 sq mi (0.29 km )
Elevation: 538 ft (164 m)
Density: 2,070.6/sq mi (799.48/km )
Time zone: UTC−6 ( CST )
Summer dst: UTC−5 ( CDT )
Fips code: 17-55249
Website: ofallon .org

via Wikipedia infobox

Article

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 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.