COUNTY
St. Clair County
Illinois · 250,708 residents (2025 est.) · 658 sq mi
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Part of the St. Louis metro area
The short version
With 253,694 people, St. Clair County is a county in Illinois. That puts it in the top 8% of US counties for household income. The typical home is worth $180,300, having more than doubled since 2000. The foreign-born share is 3%. About 32% of adults have finished a four-year degree. Median household income is $73,854, under the $82,259 national median.
At a glance
Lower income
median household income $73,854, below the US median
US median: $82,259
Mid-age
median age 39.9
US median: 38.9
Average education
32% hold a bachelor's degree
US average: 36%
Less affordable
home values up 33%, inflation adjusted
US median home: $376,019
Unique to this place
What stands out about St. Clair County
What changed most since 1990
- Hispanic share1.4% → 5.1% (+3.6 pts)US over the same years: +9.9 pts
- White share70.6% → 59.1% (−11.5 pts)US over the same years: −17.8 pts
- Median home value (2024 dollars)$131,764 → $180,300 (+37%)US over the same years: +67%
Among the 102 counties in Illinois
- 29th in household income$73,854
- 17th in share with a bachelor's degree31.8%
- 23rd in home value$180,300
- 6th in diversity score70.9
Section 01
Population & growth
253,694
−1%since 2000
from 256,082 in 2000
250,708 in 2025 (Census Bureau estimate)
1990 – 2025
Land area
658 sq mi
Population, 1990 – 2024
2024254K
Age distribution, 2024
Under 55.7%(14,421)
5 to 96.3%(16,010)
10 to 146.9%(17,536)
15 to 196.5%(16,535)
20 to 245.7%(14,547)
25 to 3412.7%(32,122)
35 to 4413.4%(33,957)
45 to 5411.9%(30,308)
55 to 6413.5%(34,251)
65 to 7410.7%(27,031)
75 to 844.6%(11,748)
85 and over2.1%(5,228)
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 02
Income & economy
$73,854
+4%inflation adjusted, since 2000
from $39,148 in 2000
US average: $82,259
1990 – 2024
Households earning $100K+
49.3%
+20.4 ptssince 2009
from 28.9% in 2009
US average: 53.3%
Workforce by industry, 2024
Information10.2%
Retail trade8.8%
Finance & insurance7.7%
Professional, scientific, technical6.7%
Other services5.9%
Wholesale trade4.8%
Public administration4.5%
Transportation & warehousing1.6%
Arts, entertainment, food1.4%
Agriculture, forestry, fishing1%
Education & health services1%
Construction0.8%
Manufacturing0.2%
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 03
Housing
$180,300
+33%inflation adjusted, since 2000
from $74,200 in 2000
US average: $376,019
1990 – 2024
2.4
−1%since 2009
from 2.5 in 2009
1990 – 2024
Years of local income it takes to buy a local home, on a scale of about 0 to 15. Lower is more affordable.
48
Our index, 0 to 100. Higher means faster recent growth in incomes, home values, and college degrees.
Section 04
Race & ethnicity
2000
White, non-Hispanic66.8%(171,151)
Black28.6%(73,282)
Hispanic / Latino2.2%(5,604)
Asian0.9%(2,257)
Other0%
2024
White, non-Hispanic59.1%(149,879)
Black27.7%(70,203)
Hispanic / Latino5.1%(12,858)
Asian1.6%(4,098)
Other6.6%(16,656)
71
+16%since 2009
from 61 in 2009
1990 – 2024
Our index, 0 to 100. Higher means a more even mix of racial and ethnic groups.
40
−16%since 2020
from 48 in 2020
Our index, 0 to 100. Higher means White and non-White residents are more separated across neighborhoods.
Section 04 · Origins
Detailed origins & ancestry
Hispanic origin
Mexican3.2%(8,043)
Puerto Rican0.6%(1,450)
Central American0.3%(821)
Cuban0.2%(411)
Honduran0.2%(410)
South American0.1%(324)
Spaniard0.1%(270)
Guatemalan0.1%(210)
Colombian0.1%(146)
Costa Rican0.1%(129)
Peruvian0%(116)
Dominican0%(81)
+ 6 more hispanic origin groups with data
Asian origin
Filipino0.5%(1,264)
Chinese0.2%(606)
Korean0.2%(599)
Asian Indian0.2%(564)
Japanese0.1%(239)
Vietnamese0.1%(223)
Pakistani0.1%(222)
Thai0.1%(180)
Nepalese0%(55)
Mongolian0%(42)
Burmese0%(39)
Cambodian0%(11)
Ancestry
German21.5%(54,517)
Irish9.7%(24,556)
English8.7%(21,995)
American4.2%(10,538)
Italian2.8%(7,013)
French2.6%(6,647)
Polish2.6%(6,588)
Scottish1.7%(4,339)
Dutch0.8%(1,956)
Scotch-Irish0.7%(1,804)
Subsaharan African0.6%(1,413)
Norwegian0.5%(1,292)
+ 45 more ancestry groups with data
Swedish0.4%(1,140)
Welsh0.4%(1,066)
Arab0.4%(932)
Czech0.3%(741)
Greek0.3%(737)
Lithuanian0.3%(691)
British0.3%(673)
Croatian0.2%(615)
Swiss0.2%(592)
West Indian0.2%(498)
Hungarian0.2%(468)
Russian0.2%(460)
Austrian0.2%(439)
Jamaican0.1%(348)
Danish0.1%(320)
Slovak0.1%(315)
Nigerian0.1%(306)
French Canadian0.1%(294)
Jordanian0.1%(285)
Armenian0.1%(256)
Ukrainian0.1%(191)
Portuguese0.1%(182)
Canadian0.1%(162)
Palestinian0%(124)
Serbian0%(121)
Ghanaian0%(103)
Trinidadian & Tobagonian0%(70)
Lebanese0%(67)
Belgian0%(64)
Brazilian0%(61)
Romanian0%(59)
Kenyan0%(50)
Syrian0%(44)
Bulgarian0%(42)
Guyanese0%(39)
Moroccan0%(37)
Finnish0%(35)
Iraqi0%(26)
Macedonian0%(25)
Iranian0%(20)
Latvian0%(19)
Turkish0%(17)
Haitian0%(16)
Australian0%(11)
Barbadian0%(7)
Section 05
Education
High school or higher
93.5%
+12.6 ptssince 2000
from 80.9% in 2000
US average: 89.6%
Section 06
Commute & transportation
Section 07
Work & employment
Women 20-64 in the labor force
75.6%
−0.3 ptssince 2020
from 75.9% in 2020
US average: 74.6%
Section 08
People & community
Computer in household
94.2%
+4.8 ptssince 2020
from 89.4% in 2020
US average: 95.5%
Marital status
Men 15+
Never married37.4%(36,779)
Married49.8%(48,995)
Widowed3%(2,935)
Divorced9.9%(9,736)
Women 15+
Never married32.1%(34,456)
Married46.5%(49,910)
Widowed9.1%(9,753)
Divorced12.3%(13,163)
SHARE WITHIN EACH SEX · POPULATION 15 AND OVER · 2024
Section 09
Health coverage
Direct-purchase
12.0%
+0.6 ptssince 2020
from 11.4% in 2020
US average: 13.8%
VA health care
3.3%
−0.1 ptssince 2020
from 3.4% in 2020
US average: 2.2%
Any private
69.7%
+1.2 ptssince 2020
from 68.5% in 2020
US average: 67.1%
Any public
40.2%
+0.5 ptssince 2020
from 39.7% 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)36.6%(8,019)
Gulf War (1990s)41.5%(9,115)
Vietnam era25.7%(5,639)
Korean War3.8%(837)
World War II1.1%(248)
Share of the 21,939 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.
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Over time
St. Clair County, decade by decade
| Year | Population | Median household income | Median home value | Bachelor's degree+ | Diversity score |
|---|---|---|---|---|---|
| 1990 | 262,852 | $64,353 | $131,764 | 14.7% | 53.5 |
| 2000 | 256,082 | $71,314 | $135,167 | 19.3% | 58.8 |
| 2010 | 270,056 | $69,860 | $176,081 | 23.9% | 63.9 |
| 2020 | 257,400 | $69,660 | $163,383 | 29.0% | 70.9 |
| 2024 | 253,694 | $73,854 | $180,300 | 31.8% | 70.9 |
Census years come from the decennial census and the latest year from the American Community Survey, so part of any change between those two rows can reflect the different surveys. Dollar figures are adjusted for inflation to 2024 dollars; a figure ending in "+" was at the Census Bureau's reporting cap that year. The diversity score runs from 0 to 100; see how it's calculated.
Drill deeper
Places similar to St. Clair County
Kalamazoo County
Pop 263,795
Madison County
Pop 263,110
Yavapai County
Pop 252,552
Canyon County
Pop 275,123
Places similar to St. Clair CountyHead to head
Compare St. Clair County to nearby counties
ST. CLAIR COUNTY VS
Monroe County
Income$102,880+39%
Home value$282,100+56%
Population34,840−86%
SEE FULL COMPARISON →
ST. CLAIR COUNTY VS
St. Louis
Income$56,160−24%
Home value$197,500+10%
Population278,144+11%
SEE FULL COMPARISON →
ST. CLAIR COUNTY VS
Madison County
Income$75,793+3%
Home value$173,000−4%
Population263,110+5%
SEE FULL COMPARISON →
ST. CLAIR COUNTY VS
Clinton County
Income$86,588+17%
Home value$192,400+7%
Population37,128−85%
SEE FULL COMPARISON →
Frequently asked
How many people live in St. Clair County, Illinois?
St. Clair County, Illinois has about 253,694 residents according to the 2024 American Community Survey.
What is the median household income in St. Clair County, Illinois?
The typical household in St. Clair County, Illinois earns about $73,854 a year. Half of households make more than that, and half make less.
Is St. Clair County, Illinois expensive?
In St. Clair County, Illinois, the median home is worth about $180,300, and the typical rent is about $1,090 a month.
How educated are people in St. Clair County, Illinois?
About 31.8% of adults age 25 and over in St. Clair County, Illinois hold a bachelor's degree or higher.
What is the poverty rate in St. Clair County, Illinois?
About 13.6% of people in St. Clair County, Illinois live below the federal poverty line.
Has St. Clair County, Illinois grown since 1990?
Yes, St. Clair County, Illinois has shrunk since 1990. The population has lost about 9,158 residents, a change of about -3 percent over that period.
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Explore from here
68 census tracts (top 20 by population)
Census Tract 5034.04Census Tract 5033.23Census Tract 5033.22Census Tract 5039.08Census Tract 5043.54Census Tract 5033.04Census Tract 5032.03Census Tract 5033.34Census Tract 5033.24Census Tract 5034.14Census Tract 5034.13Census Tract 5034.12Census Tract 5023Census Tract 5040.01Census Tract 5039.06Census Tract 5032.02Census Tract 5043.55Census Tract 5033.32Census Tract 5040.02Census Tract 5026.0227 ZIP codes
ZIP 62269ZIP 62221ZIP 62226ZIP 62220ZIP 62208ZIP 62223ZIP 62206ZIP 62258ZIP 62232ZIP 62207ZIP 62254ZIP 62260ZIP 62205ZIP 62243ZIP 62203ZIP 62225ZIP 62201ZIP 62285ZIP 62239ZIP 62204ZIP 62264ZIP 62257ZIP 62240ZIP 62255ZIP 62059ZIP 62282ZIP 62289Up the hierarchy
All counties in IllinoisDATA: US CENSUS BUREAU ACS 5-YEAR + DECENNIAL CENSUS · UPDATED 2024