St. Clair County, Illinois Population 2023

253,602

St. Clair County, Illinois's estimated 2023 population is 253,602 with a growth rate of -0.5% in the past year according to the most recent United States census data. St. Clair County, Illinois is the 9th largest county in Illinois. The 2010 population was 270,056 and has seen a growth of -6.09% since that time.

Note: data after 2021 is projected based on recent change

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Year
Population
Growth
Growth Rate
2010270,056
2011268,790-1,266-0.47%
2012267,524-1,266-0.47%
2013266,258-1,266-0.47%
2014264,992-1,266-0.48%
2015263,726-1,266-0.48%
2016262,460-1,266-0.48%
2017261,194-1,266-0.48%
2018259,928-1,266-0.48%
2019258,662-1,266-0.49%
2020257,400-1,262-0.49%
2021256,134-1,266-0.49%
2022254,868-1,266-0.49%
2023253,602-1,266-0.5%
showing: 14 rows
2023 Growth Rate
-0.5% (-1,266)
County Website
St. Clair County
Founded
1790
County Seat
Belleville
2010 Population
270,056
Growth Since 2010
-6.09% (-16,454)

St. Clair County, Illinois Population 2023

Population by Race

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Race
Population
Percentage (of total)
White161,89962.61%
Black or African American75,45529.18%
Two or more races13,0605.05%
Other race3,9151.51%
Asian3,8131.47%
Native American3580.14%
Native Hawaiian or Pacific Islander970.04%
showing: 7 rows

White

Black or African American

Two or more races

Other race

Asian

Native American

Native Hawaiian or Pacific Islander

St. Clair County, Illinois Population by Race

St. Clair County, Illinois Population Pyramid 2023

St. Clair County, Illinois Median Age

39.2

Total

37.9

Male

40.4

Female

St. Clair County, Illinois Adults

There are 197,437 adults, (41,064 of whom are seniors) in St. Clair County, Illinois.

St. Clair County, Illinois Age Dependency

65.4

Age Dependency Ratio

26.3

Old Age Dependency Ratio

39.1

Child Dependency Ratio

St. Clair County, Illinois Sex Ratio

Female133,06551.46%
Male125,53248.54%

St. Clair County, Illinois Population by Age

St. Clair County, Illinois Renter vs Owner Occupied by Household Type

Household Type
Count
Average Size
Owner
Renter
All100,0792.5566.633.4
Married44,2933.284.615.4
Non Family36,7001.1654.345.7
Female14,6253.7943.956.1
Male4,4613.286337
showing: 5 rows

3.25

Average Family Size

2.55

Average Household Size

66.6%

Rate of Home Ownership

Married

Male

Female

NonFamily

owner

renter

St. Clair County, Illinois Households and Families

Male

Female

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Less Than 9th Grade

9th to 12th Grade

High School Graduate

Some College

Associates Degree

Bachelors Degree

Graduate Degree

St. Clair County, Illinois Educational Attainment by Sex (over 25)

St. Clair County, Illinois Educational Attainment by Race

High School Graduation Rate

Bachelors Rate

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The highest rate of high school graduation is among islander people with a rate of 86.44%.

The highest rate of bachelors degrees is among asian people with a rate of 44.86%.

St. Clair County, Illinois Educational Attainment by Race

All

Male

Female

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$42,130

Average Earnings

$50,191

Average Male

$36,108

Average Female

St. Clair County, Illinois Earnings by Educational Attainment

St. Clair County, Illinois Language by Age

Only English

Spanish

Other Indo-European Languages

Asian and Pacific Island Languages

Other Languages

St. Clair County, Illinois Language

95.22% of St. Clair County, Illinois residents speak only English, while 4.78% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 2.42% of the population.

St. Clair County, Illinois Language

St. Clair County, Illinois Poverty by Race

rate

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Name
Total
In Poverty
Poverty Rate
Black73,91018,80025.44%
White154,11411,4767.45%
Hispanic11,0742,53922.93%
Multiple12,8862,33518.12%
Other3,9071,00025.6%
Asian3,7533168.42%
Native325144.31%
Islander9744.12%
showing: 8 rows

13.62%

Overall Poverty Rate

12.16%

Male Poverty Rate

15%

Female Poverty Rate

Poverty in St. Clair County, Illinois

The race most likely to be in poverty in St. Clair County, Illinois is Other, with 25.6% below the poverty level.

The race least likely to be in poverty in St. Clair County, Illinois is Islander, with 4.12% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 2.4%. Among those working part-time, it was 15.77%, and for those that did not work, the poverty rate was 20.47%.

St. Clair County, Illinois Poverty

rate

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Rate
Poverty
Less Than 9th Grade26.57%
High School15.68%
Some College9.74%
Bachelors or Greater3.85%
showing: 4 rows

St. Clair County, Illinois Poverty Rate by Education

rate

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Rate
Poverty
Female Unemployed28.33%
Male Unemployed27.18%
Female Employed9.1%
Male Employed4.19%
showing: 4 rows

St. Clair County, Illinois Poverty Rate by Employment Status and Sex

St. Clair County, Illinois Income by Household Type

Households

Families

MarriedFamilies

NonFamilies

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mean

median

Income by Household Type

St. Clair County, Illinois Marital Status

Married

Widowed

Divorced

Separated

NeverMarried

Marriage Rates

45.5%

Overall Marriage Rate

48.1%

Male Marriage Rate

43.2%

Female Marriage Rate

St. Clair County, Illinois Married by Age and Sex

male

female

St. Clair County, Illinois Marriage

The age group where males are most likely to be married is Over 65, while the female age group most likely to be married is 45-54.

St. Clair County, Illinois Marital Status by Race

Married

Widowed

Divorced

Separated

NeverMarried

St. Clair County, Illinois Marital Status

Second Gulf War

First Gulf War

Vietnam

Korea

World War II

24,613

Number of Veterans

21,465

Male Veterans

3,148

Female Veterans

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St. Clair County, Illinois Veterans by War

count

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St. Clair County, Illinois Veterans by Age

count

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St. Clair County, Illinois Veterans by Race

St. Clair County, Illinois Veterans by Education

Less Than 9th Grade

High School Graduate

Some College

Bachelors or Greater

6.79%

Veteran Poverty Rate

23.61%

Veteran Disability Rate

St. Clair County, Illinois Veterans by Education

LaborForceParticipation

64.7%

Labor Force Participation

59.3%

Employment Rate

5.7%

Unemployment Rate

St. Clair County, Illinois Employment by Age

LaborForceParticipation

St. Clair County, Illinois Employment by Race

LaborForceParticipation

St. Clair County, Illinois Employment by Education

Origin of Non-Citizens

Europe

Asia

Africa

Oceania

Latin America

North America

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

Origin of Naturalized Citizens

Europe

Asia

Africa

Oceania

Latin America

North America

58.53%

Born in St. Clair County, Illinois

98.69%

Native Born

3.12%

Foreign Born

1.44%

Non Citizen

1.67%

Naturalized

Place of Birth

98.69% of St. Clair County, Illinois residents were born in the United States, with 58.53% having been born in Illinois. 1.44% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

St. Clair County, Illinois Place of Birth

Sources