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St. Clair County, Illinois

County

Population: 254,777 (2023 estimate)

Located in Illinois

County-level Census Bureau data covering income, housing, demographics, education, employment, and more. Counties are the primary administrative division in the U.S. and the most common unit for comparing local conditions across a state.

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Data: U.S. Census Bureau, ACS 5-Year Estimates, 2023 (released December 2024).

Quick Facts — St. Clair County

What is the median household income in St. Clair County?
The median household income in St. Clair County is $70,178 (U.S. Census Bureau ACS 5-Year Estimates, 2023).
What is the poverty rate in St. Clair County?
The poverty rate in St. Clair County is 9.5% (U.S. Census Bureau ACS 2023).
What is the median home value in St. Clair County?
$168,800 (U.S. Census Bureau ACS 2023).
What is the average rent in St. Clair County?
The median gross rent in St. Clair County is $1,032 per month (U.S. Census Bureau ACS 2023).
What percentage of St. Clair County residents have a college degree?
30.7% of adults in St. Clair County hold a bachelor's degree or higher (U.S. Census Bureau ACS 2023).
Population
254,777
Median Income
$70,178
Median Home Value
$168,800
Poverty Rate
9.5%
Unemployment (ACS 2023)
5.7%
Median Age
39.0 yrs
Since 2019 Median Income: +$14,999 (+27.2%) Home Value: +$40,800 (+31.9%) Poverty Rate: -1.2 pp (-11.2%) Bachelor's+: +2.7 pp (+9.6%) Unemployment: -1.0 pp (-14.9%)

Demographics

Total Population 254,777
Median Age 39.0
Female 51.5%
Race & Ethnicity
Hispanic or Latino 4.9% White (non-Hisp.) 59.5% Black 28.0% Asian 1.6% Two or More 7.1% Other 1.9%
Asian Subgroups (% of total pop.)
Filipino
0.4%
Indian
0.3%
Chinese
0.2%
Korean
0.2%
Vietnamese
0.1%
Japanese
0.1%
Hispanic Subgroups (% of total pop.)
Mexican
3.2%
Puerto Rican
0.6%
Cuban
0.2%

Source: U.S. Census Bureau, ACS 5-Year Estimates, 2023

Income & Poverty

Median Household Income $70,178 ±$2,013
-$11,524 vs. state
Per Capita Income $91,047
Median Family Income $92,727
Poverty Rate 9.5%
+1.3 pp vs. state
Child Poverty Rate 15.0%
Working-Age Poverty Rate
SNAP Recipients 16.4%
Social Security Income
Retirement Income 30.2%
Household Income Distribution
< $10k
5.8%
$10–15k
3.7%
$15–25k
7.9%
$25–35k
7.2%
$35–50k
12.5%
$50–75k
16.0%
$75–100k
13.1%
$100–150k
15.9%
$150–200k
9.3%
$200k+
8.7%

Source: U.S. Census Bureau, ACS 5-Year Estimates, 2023

Housing

Total Housing Units 115,348
Owner-Occupied 67.8%
Renter-Occupied 32.2%
Vacancy Rate 12.2%
Median Home Value $168,800
-$81,700 vs. state
Median Gross Rent $1,032
Owner Cost Burden (30%+) 17.4%
Renter Cost Burden (30%+) 39.1%
Home Value Distribution
< $50k
12.1%
$50–100k
16.2%
$100–200k
16.1%
$200–300k
22.1%
$300–500k
15.6%
$500k–$1M
3.0%
$1M+
0.3%
Gross Rent Distribution
< $500
10.7%
$500–1k
36.5%
$1–1.5k
35.8%
$1.5–2k
12.4%
$2–2.5k
2.4%
$2.5–3.5k
1.0%
$3.5k+
1.2%
Vehicle Availability
No vehicle
7.6%
1 vehicle
35.5%
2 vehicles
36.5%
3+
20.4%
Housing Type
Single-fam. det.
71.4%
Single-fam. att.
4.7%
2–4 units
3.3%
5–19 units
5.9%
20+ units
3.2%
Mobile home
4.6%
Housing Age
Pre-1940
13.4%
1940–1969
5.5%
1970–1999
10.7%
2000–2009
13.8%
2010+
7.0%

Source: U.S. Census Bureau, ACS 5-Year Estimates, 2023

Education

High School or Higher 92.7%
Bachelor's or Higher 30.7%
-6.5 pp vs. state
Graduate Degree 13.2%
Some College / Associate 23.9%
Less Than High School 2.4%
Enrolled in School

Source: U.S. Census Bureau, ACS 5-Year Estimates, 2023

Employment

Labor Force Participation 63.4%
Unemployment Rate 5.7%
-0.1 pp vs. state
Work from Home 10.9%
Self-Employed 4.1%
Government Workers 17.0%
Private For-Profit 78.8%
Industry
Edu/Health
23.1%
Prof. Services
12.0%
Retail
10.7%
Arts/Entmt.
10.2%
Manufacturing
8.9%
Transportation
8.2%
Public Admin
7.0%
Finance
6.4%
Construction
5.2%
Wholesale
1.6%
Information
1.3%
Agriculture
1.2%
Occupation
Management
39.4%
Sales
20.4%
Food Prep
17.9%
Production
14.7%
Construction
7.5%

Source: U.S. Census Bureau, ACS 5-Year Estimates, 2023

Commute

Median Travel Time 24.7 min
Drove Alone 76.9%
Carpool 7.7%
Public Transit 1.9%
Work from Home 10.9%
Walked 1.5%
Bicycle

Source: U.S. Census Bureau, ACS 5-Year Estimates, 2023

Households & Families

Total Households 101,273
Avg. Household Size 2.00
Avg. Family Size
Married-Couple Households 43.9%
Single-Mother Households
Single-Father Households
Living Alone
Households with Children 16.4%
Multigenerational

Source: U.S. Census Bureau, ACS 5-Year Estimates, 2023

Age Distribution

Under 5
5.8%
5–9
6.3%
10–14
7.1%
15–19
6.5%
20–24
5.8%
25–34
12.8%
35–44
13.2%
45–54
12.1%
55–64
6.7%
65–74
7.1%
75–84
10.3%
85+
4.4%
Under 18: 23.3% Working age (18–64): 76.7% 65 and over: 16.8%

Source: U.S. Census Bureau, ACS 5-Year Estimates, 2023

Social Characteristics

Immigration

Foreign Born 3.2%
Naturalized Citizen 56.7%
Speaks English Less Than Very Well 1.5%
Foreign-Born Origin
Asia
44.1%
Latin America
31.8%
Europe
13.6%
Africa
6.8%

Veterans & Disability

Veteran 11.8%
With a Disability 15.1%
Cognitive Difficulty
Ambulatory Difficulty

Health Insurance

Insured 94.6%
Uninsured 5.4%
Employer Insurance
Medicaid
Medicare

Technology & Mobility

Broadband Internet 88.1%
Has a Computer 93.3%
Same House 1 Year Ago 88.2%
Moved from Abroad 0.5%

Source: U.S. Census Bureau, ACS 5-Year Estimates, 2023

Compare St. Clair County

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Where People Move From (IRS Migration Data)

Top origins of people who moved to St. Clair County in 2023, by number of tax returns filed (IRS SOI Migration Data).

Origin Tax Returns People (est.)
Other flows - South 1,068 2,174
Madison County 983 1,764
Other flows - Midwest 566 1,049
St. Louis County 560 926
St. Louis city 411 692
Other flows - West 405 832
Foreign - Other flows 199 501
Monroe County 168 273
Clinton County 146 242
Other flows - Northeast 121 194