O'Fallon city, Illinois demographics and economy

Census American Community Survey 2023 5-Year Estimates for O'Fallon city, Illinois.

Population
32,139
Median HH Income
$102,793
Median Home Value
$274,100
Median Age
36.9

Workforce

Unemployment rate
3.3%
511 unemployed of 15,286 in labor force
Bachelor's degree or higher
27.9%
of population age 25+ (21,213 total)
Below poverty line
4.4%
1,401 of 31,939 surveyed

Housing & cost of living

Median home value
$274,100
owner-occupied housing units
Median gross rent
$1,312/mo
renter-occupied units, all bedrooms

Related resources

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GovBids — SAM.gov opportunities and award data filtered by state.
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Market size estimator
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Similar-sized Illinois places

Data source: U.S. Census Bureau American Community Survey 2023 5-Year Estimates (Table B). Geography: place (incorporated city/town/CDP). Public domain (USA.gov).

Indicators: B01003 (population), B19013 (median household income), B25077 (median home value), B01002 (median age), B25064 (median gross rent), B23025 (labor force/unemployment), B15003 (educational attainment), B17001 (poverty).

Generated 2026-05-27. Census applies suppression rules to small populations; some values may be unavailable.