O'Fallon
In St. Clair County, Illinois — population 29,606 as of 2020.
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Today
86°F
Sunny7% precip
Tonight
64°F
Mostly Clear1% precip
Sunday
84°F
Sunny
Sunday Night
62°F
Partly Cloudy3% precip
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O'Fallon by the numbers
Population
29,606Population figure, 2020
Households & income
- Area
- 15.76 sq mi (40.81 km²), 0.11 sq mi water
- Median age
- 37.8
- Households
- 12,816
- Persons per household
- 2.5
- Median household income
- $105,982
- Median house value
- $295,700
Municipal office
- Office
- CITY ADMINISTRATOR
- Address
- 255 S LINCOLN AVE, O FALLON, IL 62269