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CITY · 1990 CENSUS

O'Fallon

Illinois · 16,073 residents · 15.791 sq mi
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The short version

O'Fallon is wealthier than most US places, with a median household income of $36,041. Population has fallen 27% since 2000, a loss of 5,837 residents. 29% of adults hold a bachelor's degree or higher, well above the national rate of 20%. Median home value is $77,800. Poverty is rare here, at 5.1% of residents.

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

Total population
16,073
−27%vs 2000
vs 21,910 in 2000
1990 – 2025
Median age
33.1
−6%vs 2000
vs 35.3 in 2000
US average: 33.0
Population, 1990 – 2024
14K19K24K29K34K1990201020202024O'Fallon
202432K
1990201020202024
Age distribution, 1990
Under 56.8%(1,094)
US avg: 7.3%
5 to 98.9%(1,438)
US avg: 7.3%
10 to 147.2%(1,156)
US avg: 6.9%
15 to 197.3%(1,175)
US avg: 7.1%
20 to 246.4%(1,026)
US avg: 7.5%
25 to 3416.7%(2,691)
US avg: 17.5%
35 to 4419.1%(3,076)
US avg: 15.1%
45 to 5410.9%(1,749)
US avg: 10.2%
55 to 647.8%(1,258)
US avg: 8.5%
65 to 745.5%(887)
US avg: 7.3%
75 to 842.5%(409)
US avg: 4%
85 and over0.7%(114)
US avg: 1.2%
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 02

Income & economy

Median household income
$36,041
−15%inflation adjusted, since 2000
vs $55,927 in 2000
US average: $30,130
1990 – 2024
Per capita income
$16,538
−33%vs 2000
vs $24,821 in 2000
US average: $14,340
Poverty rate
5.1%
+0.1 ptsvs 2000
vs 5.0% in 2000
US average: 13.2%
Section 03

Housing

Median home value
$77,800
−8%inflation adjusted, since 2000
vs $111,800 in 2000
US average: $93,722
1990 – 2024
Median gross rent
$522
+4%inflation adjusted, since 2000
vs $660 in 2000
US average: $450
Owner-occupied
65.9%
−2.8 ptsvs 2000
vs 68.7% in 2000
34.1% rent
RELATED:See current rent listings in O'Fallon on RentDataNow
Section 04

Race & ethnicity

2000
White, non-Hispanic81.4%(17,831)
Black11.9%(2,603)
Hispanic / Latino2.2%(488)
Asian2.4%(535)
Other0%
1990
White, non-Hispanic89.1%(14,314)
Black8.4%(1,356)
Hispanic / Latino1.9%(302)
Asian1.8%(289)
Other0.7%(114)

No data for the years selected.

Section 04 · Origins

Detailed origins & ancestry

Detailed origin tables are available for 2024; showing 2024 data.

Hispanic origin
Mexican2.3%(752)
Puerto Rican0.6%(192)
Spaniard0.5%(174)
Honduran0.3%(82)
Dominican0.1%(39)
Peruvian0.1%(30)
Colombian0%(16)
Asian origin
Filipino0.9%(300)
Asian Indian0.5%(174)
Korean0.4%(120)
Japanese0.4%(113)
Vietnamese0.1%(44)
Chinese0.1%(19)
Thai0%(11)
Okinawan0%(10)
Pacific Islander origin
Samoan0.1%(35)
Chamorro0.1%(31)
Ancestry
German23.5%(7,577)
English15.3%(4,938)
Irish10.6%(3,419)
Polish4.2%(1,371)
American3.9%(1,262)
Italian3.7%(1,192)
French3.4%(1,113)
Scottish2.4%(786)
Norwegian1.6%(530)
Arab1.4%(453)
Dutch1.3%(411)
Welsh1.1%(360)
+ 30 more ancestry groups with data
Scotch-Irish1.1%(341)
Swedish0.9%(294)
Swiss0.6%(206)
Croatian0.4%(142)
West Indian0.4%(129)
Greek0.4%(126)
Austrian0.4%(123)
Lithuanian0.4%(119)
Ukrainian0.4%(118)
Jamaican0.3%(111)
Canadian0.3%(106)
Danish0.3%(101)
British0.3%(99)
Russian0.3%(93)
Czech0.3%(88)
Nigerian0.2%(73)
Hungarian0.2%(70)
Palestinian0.2%(65)
Jordanian0.2%(64)
Iraqi0.1%(26)
Syrian0%(15)
Guyanese0%(13)
Serbian0%(13)
Slovak0%(10)
Ghanaian0%(10)
RANKED:Largest German population · Largest English population · Largest Irish population · Largest Polish population · Largest American population
Section 05

Education

Bachelor's degree or higher
29.2%
−9.5 ptsvs 2000
vs 38.7% in 2000
US average: 20.3%
High school or higher
88.2%
−4.1 ptsvs 2000
vs 92.3% in 2000
US average: 75.2%
Graduate degree
13.2%
−3.7 ptsvs 2000
vs 17.0% in 2000
US average: 7.1%
Section 06

Commute & transportation

Average commute
20.0 min
+30%vs 2000
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 married29.9%(3,701)
Married60.2%(7,446)
Widowed2.2%(274)
Divorced7.7%(952)
Women 15+
Never married23.3%(2,997)
Married60.9%(7,834)
Widowed7.8%(1,006)
Divorced8%(1,029)
SHARE WITHIN EACH SEX · POPULATION 15 AND OVER · 2024
Drill deeper

Places similar to O'Fallon

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Pop 32,070
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Pop 30,444
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Pop 33,067
East Lake
Pop 33,283
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Head to head

Compare O'Fallon to nearby cities

O'FALLON VS
Shiloh
Income$99,573+176%
Home value$274,000+252%
Population14,604−55%
SEE FULL COMPARISON →
O'FALLON VS
Fairview Heights
Income$80,930+125%
Home value$177,700+128%
Population16,175−50%
SEE FULL COMPARISON →
O'FALLON VS
Swansea
Income$91,587+154%
Home value$223,600+187%
Population14,356−56%
SEE FULL COMPARISON →
O'FALLON VS
Belleville
Income$63,535+76%
Home value$141,300+82%
Population40,237+23%
SEE FULL COMPARISON →
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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DATA: US CENSUS BUREAU ACS 5-YEAR + DECENNIAL CENSUS · UPDATED 2024

How we source and harmonize this data →