United States › Illinois › O'Fallon CITY · 2000 CENSUS
O'Fallon Illinois · 21,910 residents · 15.8 sq mi
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The short version
With 21,910 people, O'Fallon is a city in Illinois. 39% of adults hold a bachelor's degree, against 24% nationally. Growth has run 36% since 1990, or 5,837 more people. Poverty is uncommon here, at 5.0% of locals. That is roughly 20% ahead of the Illinois median. The median household earns $55,927, about 31% above the national median.
At a glance
Wealthier
above the US median
US median: $42,589
Mid-age
median age 35.3
US median: 35.2
More educated
39% hold a bachelor's degree
US average: 24%
Stable housing
home values roughly flat, inflation adjusted
US median home: $120,530
Section 01
Population & growth from 33.1 in 1990
US average: 35.2
Population, 1990 – 2024
14K 19K 24K 29K 34K 1990 2000 2010 2020 2024 O'Fallon Age distribution, 2000
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 02
Income & economy $55,927
+18%inflation adjusted, since 1990
from $36,041 in 1990
US average: $42,589
from $16,538 in 1990
US average: $21,522
from 5.1% in 1990
US average: 12.4%
$111,800
+9%inflation adjusted, since 1990
from $77,800 in 1990
US average: $120,530
$660
−4%inflation adjusted, since 1990
from $522 in 1990
US average: $602
from 65.9% in 1990
31.3% rent
Section 04
Race & ethnicity 1990
White, non-Hispanic 89.1%(14,314)
Hispanic / Latino 1.9%(302)
2000
White, non-Hispanic 81.4%(17,831)
Hispanic / Latino 2.2%(488)
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 from 29.2% in 1990
US average: 24.4%
High school or higher
from 88.2% in 1990
US average: 80.3%
from 13.2% in 1990
US average: 8.8%
Section 06
Commute & transportation from 20.0 min in 1990
US average: 17.6
Section 07
Work & employment No data for the years selected.
Section 08
People & community No data for the years selected.
Marital status
Men 15+
Never married 24.3%(1,904)
Women 15+
Never married 22.4%(2,004)
SHARE WITHIN EACH SEX · POPULATION 15 AND OVER · 2000
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.
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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 21,910 residents according to the 2000 Census.
What is the median household income in O'Fallon, Illinois? The typical household in O'Fallon, Illinois earns about $55,927 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 $111,800, and the typical rent is about $660 a month.
How educated are people in O'Fallon, Illinois? About 38.7% 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 5.0% of people in O'Fallon, Illinois live below the federal poverty line.
Has O'Fallon, Illinois grown since 1990? Yes, O'Fallon, Illinois has grown since 1990. The population has added about 5,837 residents, a change of about 36 percent over that period.
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