United States › Illinois › O'Fallon CITY · 1990 CENSUS
O'Fallon Illinois · 16,073 residents · 15.8 sq mi
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The short version
O'Fallon is home to 16,073 people in Illinois. 29% of adults hold a bachelor's degree or higher. There are 5,837 fewer people here than in 2000. Poverty is uncommon here, at 5.1% of locals. The median household earns $36,041, about 20% above the national median. Median home value sits at $77,800.
At a glance
Wealthier
above the US median
US median: $30,130
Mid-age
median age 33.1
US median: 33.0
More educated
29% hold a bachelor's degree
US average: 20%
More affordable
home values down 8%, inflation adjusted
US median home: $93,722
Section 01
Population & growth vs 35.3 in 2000
US average: 33.0
Population, 1990 – 2024
14K 19K 24K 29K 34K 1990 2000 2010 2020 2024 O'Fallon Age distribution, 1990
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 02
Income & economy $36,041
−15%inflation adjusted, since 2000
vs $55,927 in 2000
US average: $30,130
vs $24,821 in 2000
US average: $14,340
vs 5.0% in 2000
US average: 13.2%
$77,800
−8%inflation adjusted, since 2000
vs $111,800 in 2000
US average: $93,722
$522
+4%inflation adjusted, since 2000
vs $660 in 2000
US average: $450
vs 68.7% in 2000
34.1% rent
Section 04
Race & ethnicity 2000
White, non-Hispanic 81.4%(17,831)
Hispanic / Latino 2.2%(488)
1990
White, non-Hispanic 89.1%(14,314)
Hispanic / Latino 1.9%(302)
No data for the years selected.
Section 04 · Origins
Detailed origins & ancestry Detailed origin tables are available for 2024; showing 2024 data.
Ancestry
+ 30 more ancestry groups with data vs 38.7% in 2000
US average: 20.3%
High school or higher
vs 92.3% in 2000
US average: 75.2%
vs 17.0% in 2000
US average: 7.1%
Section 06
Commute & transportation vs 15.4 min in 2000
US average: 21.9
Section 07
Work & employment No data for the years selected.
Section 08
People & community No data for the years selected.
Marital status (2024)
Men 15+
Never married 29.9%(3,701)
Women 15+
Never married 23.3%(2,997)
SHARE WITHIN EACH SEX · POPULATION 15 AND OVER · 2024
Section 09
Health coverage Showing 2024 (the nearest year with coverage data).
from 5.1% in 2013
US average: 8.4%
from 62.1% in 2020
US average: 54.8%
Direct-purchase
from 10.2% in 2020
US average: 13.8%
from 16.5% in 2020
US average: 18.4%
from 12.7% in 2020
US average: 20.9%
VA health care
from 5.1% in 2020
US average: 2.2%
Any private
from 83.7% in 2020
US average: 67.1%
Any public
from 30.8% in 2020
US average: 36.7%
Shares are "alone or in combination": a person with both Medicare and Medicaid counts in each, so categories overlap and do not sum to 100%.
Section 09 · Service history
Veterans Veterans by period of service, 2024
Gulf War (2001 or later) 46.5%(2,175)
Gulf War (1990s) 54.6%(2,556)
Share of the 4,679 veterans here. A veteran who served across eras counts in each, so shares can total more than 100%. Peacetime-only service is included in the total but not shown as an era.
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Drill deeper
Places similar to O'Fallon Head to head
Compare O'Fallon to nearby cities O'FALLON VS
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O'FALLON VS
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Frequently asked
How many people live in O'Fallon, Illinois? O'Fallon, Illinois has about 16,073 residents according to the 1990 Census.
What is the median household income in O'Fallon, Illinois? The typical household in O'Fallon, Illinois earns about $36,041 a year. Half of households make more than that, and half make less.
Is O'Fallon, Illinois expensive? In O'Fallon, Illinois, the median home is worth about $77,800, and the typical rent is about $522 a month.
How educated are people in O'Fallon, Illinois? About 29.2% of adults age 25 and over in O'Fallon, Illinois hold a bachelor's degree or higher.
What is the poverty rate in O'Fallon, Illinois? About 5.1% of people in O'Fallon, Illinois live below the federal poverty line.
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