O'Fallon, Illinois Population 2021

29,635
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O'Fallon is a city located in Illinois. With a 2020 population of 29,635, it is the 65th largest city in Illinois and the 1305th largest city in the United States . O'Fallon is currently growing at a rate of 0.09% annually and its population has increased by 4.79% since the most recent census, which recorded a population of 28,281 in 2010. O'Fallon reached it's highest population of 29,635 in 2021. Spanning over 15 miles, O'Fallon has a population density of 1,929 people per square mile.

The average household income in O'Fallon is $105,152 with a poverty rate of 4.28%. The median rental costs in recent years comes to $1,066 per month, and the median house value is $207,900. The median age in O'Fallon is 36.7 years, 35.5 years for males, and 38 years for females.

O'Fallon Demographics

According to the most recent ACS, the racial composition of O'Fallon was:

  • White: 79.48%
  • Black or African American: 11.76%
  • Two or more races: 4.12%
  • Asian: 3.09%
  • Other race: 1.44%
  • Native American: 0.11%
  • Native Hawaiian or Pacific Islander: 0.00%
The current population of O'Fallon, Illinois is 29,635 based on our projections of the latest US Census estimates. The US Census estimates the 2018 population at 29,557.The last official US Census in 2010 recorded the population at 28,281.

O'Fallon, Illinois Population 2021

Population by Race

Race Population Percentage
White23,31379.48%
Black or African American3,45011.76%
Two or More Races1,2094.12%
Asian9073.09%
Some Other Race4231.44%
American Indian and Alaska Native310.11%
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O'Fallon Population by Race

O'Fallon Population Pyramid $2021

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O'Fallon Median Age

36.7


Total

35.5


Male

38


Female

O'Fallon Adults

There are 21,317 adults, (3,469 of whom are seniors) in O'Fallon.

O'Fallon Age Dependency

64.3

Age Dependency Ratio

19.4

Old Age Dependency Ratio

44.9

Child Dependency Ratio

O'Fallon Sex Ratio

Female

15,114

51.53%

Male

14,219

48.47%

O'Fallon Population by Age

O'Fallon Renter vs Owner Occupied by Household Type

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O'Fallon Household Types

Type Owner Renter
Married83.6%16.4%
All69.2%30.8%
Male68.7%31.3%
Non Family46.5%53.5%
Female46.3%53.7%

69.2%

Rate of Home Ownership

O'Fallon Households and Families

Type Count Average Size Owned
All10,9742.6769.2
Married6,4373.2383.6
Non Family2,9291.1346.5
Female1,1483.2746.3
Male4603.2568.7

3.18

Average Family Size

2.67

Average Household Size

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O'Fallon Households by Type

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Education Attained Count Percentage
Less Than 9th Grade2131.11%
9th to 12th Grade3912.03%
High School Graduate2,99115.52%
Some College4,20821.84%
Associates Degree2,25111.68%
Bachelors Degree4,87525.30%
Graduate Degree4,33922.52%
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O'Fallon Educational Attainment by Sex (over 25)

O'Fallon Educational Attainment by Race

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Race Total High School Bachelors
White15,28914,9347,610
Black2,1642,068814
Hispanic852812337
Asian597484300
2+ Races412398177
Other Race27527596
Native American1818

The highest rate of high school graduation is among native american people with a rate of 100.00%.

The highest rate of bachelors degrees is among asian people with a rate of 50.25%.

O'Fallon Educational Attainment by Race

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Name Average Male Female
Overall$54,180$69,410$39,322
Less Than 9th Grade$20,809$30,250$
High School Graduate$38,157$48,261$25,224
Some College$41,579$54,330$27,372
Bachelors Degree$60,725$74,535$48,953
Graduate Degree$85,614$99,041$63,953

$54,180

Average Earnings

$69,410

Average Male

$39,322

Average Female

O'Fallon Earnings by Educational Attainment

O'Fallon Language by Age

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O'Fallon Language

92.89% of O'Fallon residents speak only English, while 7.11% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 2.49% of the population.

O'Fallon Language

O'Fallon Poverty by Race

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Name Total In Poverty Poverty Rate
White22,3098473.80%
Black3,4392878.35%
Multiple1,166998.49%
Hispanic1,436261.81%
Asian907171.87%

4.28%

Overall Poverty Rate

4.09%

Male Poverty Rate

4.47%

Female Poverty Rate

Poverty in O'Fallon

The race most likely to be in poverty in O'Fallon is Multiple, with 8.49% below the poverty level.

The race least likely to be in poverty in O'Fallon is Hispanic, with 1.81% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 0.95%. Among those working part-time, it was 9.99%, and for those that did not work, the poverty rate was 5.78%.

O'Fallon Poverty

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Name Poverty
Less Than 9th Grade9.93%
High School5.08%
Some College4.03%
Bachelors or Greater2.87%

O'Fallon Poverty Rate by Education

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Rate Poverty
Female Unemployed22.67%
Male Unemployed16.70%
Female Employed4.45%
Male Employed1.91%

O'Fallon Poverty Rate by Employment Status and Sex

O'Fallon Income by Household Type

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Name Median Mean
Households$90,349$105,152
Families$104,659$121,917
Married Families$119,478-
Non Families$45,208$57,168
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Income by Household Type

O'Fallon Marital Status

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Marriage Rates

58.8%

Overall Marriage Rate

60.3%

Male Marriage Rate

57.4%

Female Marriage Rate

O'Fallon Married by Age and Sex

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O'Fallon Marriage

The age group where males are most likely to be married is 55-64, while the female age group most likely to be married is 55-64.

O'Fallon Marital Status by Race

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O'Fallon Marital Status

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3,615

Number of Veterans

2,978

Male Veterans

637

Female Veterans

War Veterans
First Gulf War2,103
Second Gulf War1,815
Vietnam1,040
Korea121
World War II18

O'Fallon Veterans by War

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Age Group Veterans
35 to 541,561
55 to 64775
65 to 74649
18 to 34316
75+314

O'Fallon Veterans by Age

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Name Veterans % of Total
White3,11918.75%
Black35614.25%
2+ Races12526.37%
Hispanic576.54%
Native American844.44%
Asian71.17%

O'Fallon Veterans by Race

O'Fallon Veterans by Education

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1.44%

Veteran Poverty Rate

16.29%

Veteran Disability Rate

O'Fallon Veterans by Education

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69.2%

Labor Force Participation

62.3%

Employment Rate

4.5%

Unemployment Rate

O'Fallon Employment by Age

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O'Fallon Employment by Race

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O'Fallon Employment by Education

Origin of Non-Citizens

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Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.

Origin of Naturalized Citizens

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47.67%

Born in O'Fallon

95.50%

Native Born

4.50%

Foreign Born

1.79%

Non Citizen

2.71%

Naturalized

Place of Birth

95.50% of O'Fallon residents were born in the United States, with 47.67% having been born in Illinois. 1.79% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

O'Fallon Place of Birth

Year Population Growth Annual Growth Rate
202129,635260.09%
202029,609260.09%
201929,583260.09%
201829,5572370.81%
201729,3201670.57%
201629,153550.19%
201529,098-30-0.10%
201429,128-71-0.24%
201329,199-112-0.38%
201229,311-96-0.33%
201129,4076102.12%
201028,7976,8872.77%
200021,9105,8373.15%
199016,0733,9002.82%
198012,1734,9055.29%
19707,2683,2506.11%
19604,0189962.89%
19503,0220.00%

O'Fallon Population by Year