COUNTY
St. Clair County
Illinois · 250,708 residents (2025 est.) · 657.735 sq mi
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Part of the St. Louis metro area
The short version
St. Clair County has lower-than-average household income, with a median household income of $73,854. Population has held roughly steady since 2000. Median home value has more than doubled since 2000, reaching $180,300. It sits in the top 10% of US counties for household income.
At a glance
Lower income
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
Section 01
Population & growth
PEP 2025 EST:250,708 residents (Census Bureau Vintage 2025, released March 2026)
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
2009 – 2024
Our index: median home value divided by median household income. Lower is more affordable.
48
Our index, 0 to 100. Higher means faster recent growth in incomes, home values, and college degrees.
RELATED:See current rent listings in St. Clair County on RentDataNow
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
2009 – 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
Section 08
People & community
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
Drill deeper
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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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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