COUNTY · 2020 ACS
St. Clair County
Illinois · 257,400 residents · 658 sq mi
Time machine
VIEWING
COMPARE TO
Part of the St. Louis metro area
The short version
With 257,400 people, St. Clair County is a county in Illinois. The typical home is worth $134,800, having more than doubled since 2000. The foreign-born share is 3%. Households here earn about 16% less than in Illinois as a whole. About 29% of adults have finished a four-year degree. Median household income is $57,473, under the $66,278 national median.
At a glance
Lower income
below the US median
US median: $66,278
Mid-age
median age 39.3
US median: 38.8
Average education
29% hold a bachelor's degree
US average: 33%
Stable housing
home values roughly flat, inflation adjusted
US median home: $265,253
Section 01
Population & growth
Land area
658 sq mi
Population, 1990 – 2024
2024254K
Age distribution, 2020
Under 55.8%(15,033)
5 to 96.5%(16,689)
10 to 147%(18,039)
15 to 196.5%(16,804)
20 to 245.9%(15,224)
25 to 3412.5%(32,251)
35 to 4412.8%(33,006)
45 to 5412.2%(31,433)
55 to 6414.1%(36,251)
65 to 7410%(25,712)
75 to 844.6%(11,740)
85 and over2%(5,218)
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 02
Income & economy
$57,473
−2%inflation adjusted, since 2000
from $39,148 in 2000
US average: $66,278
1990 – 2024
Households earning $100K+
38.5%
+9.5 ptssince 2009
from 28.9% in 2009
US average: 43.9%
Workforce by industry, 2020
Information11.8%
Retail trade8.4%
Finance & insurance7.5%
Professional, scientific, technical6.4%
Other services6.1%
Wholesale trade5.3%
Public administration4.5%
Transportation & warehousing1.9%
Arts, entertainment, food1.5%
Education & health services1.1%
Agriculture, forestry, fishing0.9%
Construction0.7%
Manufacturing0.3%
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 03
Housing
$134,800
+21%inflation adjusted, since 2000
from $74,200 in 2000
US average: $265,253
1990 – 2024
2.3
−5%since 2009
from 2.5 in 2009
2009 – 2024
Years of local income it takes to buy a local home, on a scale of about 0 to 15. Lower is more affordable.
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%
2020
White, non-Hispanic58.5%(150,496)
Black29.5%(76,013)
Hispanic / Latino4.9%(12,582)
Asian1.4%(3,623)
Other3.6%(9,354)
48
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
Mexican2.9%(7,495)
Puerto Rican0.4%(1,078)
Spaniard0.2%(561)
Central American0.2%(526)
Honduran0.1%(193)
Salvadoran0.1%(184)
Cuban0.1%(178)
South American0.1%(147)
Guatemalan0%(96)
Colombian0%(57)
Dominican0%(53)
Panamanian0%(53)
+ 4 more hispanic origin groups with data
Asian origin
Filipino0.4%(926)
Asian Indian0.3%(671)
Chinese0.2%(639)
Korean0.2%(398)
Mongolian0.1%(203)
Thai0.1%(188)
Pakistani0.1%(180)
Vietnamese0.1%(176)
Japanese0.1%(163)
Bangladeshi0%(29)
Laotian0%(23)
Malaysian0%(12)
+ 3 more asian origin groups with data
Ancestry
German21.9%(57,294)
Irish9.1%(23,760)
English6.4%(16,633)
American4.1%(10,832)
Italian2.8%(7,366)
Polish2.5%(6,515)
French2.5%(6,505)
Scottish1.3%(3,359)
Dutch0.8%(2,215)
Subsaharan African0.6%(1,601)
Scotch-Irish0.6%(1,586)
Norwegian0.6%(1,487)
+ 44 more ancestry groups with data
Welsh0.5%(1,435)
Swedish0.5%(1,369)
British0.4%(1,127)
Austrian0.4%(940)
West Indian0.4%(924)
Greek0.3%(879)
Czech0.3%(856)
Hungarian0.3%(805)
French Canadian0.3%(659)
Lithuanian0.2%(596)
Russian0.2%(563)
Croatian0.2%(560)
Swiss0.2%(499)
Danish0.2%(420)
Jamaican0.2%(406)
Haitian0.1%(384)
Slovak0.1%(250)
Portuguese0.1%(242)
Ethiopian0.1%(241)
Nigerian0.1%(234)
Armenian0.1%(227)
Canadian0.1%(191)
Belgian0.1%(187)
Romanian0.1%(178)
Australian0.1%(155)
Lebanese0%(130)
Egyptian0%(111)
Jordanian0%(109)
Ukrainian0%(100)
Finnish0%(87)
Guyanese0%(70)
Iranian0%(49)
Serbian0%(38)
Brazilian0%(33)
Moroccan0%(19)
Slovene0%(18)
Trinidadian & Tobagonian0%(18)
Bulgarian0%(14)
Turkish0%(13)
Barbadian0%(12)
Macedonian0%(10)
Latvian0%(8)
Israeli0%(6)
Syrian0%(4)
Section 05
Education
High school or higher
91.7%
+10.8 ptssince 2000
from 80.9% in 2000
US average: 88.5%
Section 06
Commute & transportation
Section 07
Work & employment
Women 20-64 in the labor force
75.9%
US average: 73.3%
Section 08
People & community
Computer in household
89.4%
US average: 91.9%
Marital status (2024)
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
11.4%
US average: 13.7%
VA health care
3.4%
US average: 2.3%
Any private
68.5%
US average: 68.1%
Any public
39.7%
US average: 35.2%
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, 2020
Gulf War (2001 or later)28%(6,915)
Gulf War (1990s)34.9%(8,627)
Vietnam era32.5%(8,024)
Korean War5.8%(1,435)
World War II2.6%(652)
Share of the 24,717 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
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+79%
Home value$282,100+109%
Population34,840−86%
SEE FULL COMPARISON →
ST. CLAIR COUNTY VS
St. Louis
Income$56,160−2%
Home value$197,500+47%
Population278,144+11%
SEE FULL COMPARISON →
ST. CLAIR COUNTY VS
Madison County
Income$75,793+32%
Home value$173,000+28%
Population263,110+5%
SEE FULL COMPARISON →
ST. CLAIR COUNTY VS
Clinton County
Income$86,588+51%
Home value$192,400+43%
Population37,128−85%
SEE FULL COMPARISON →
Frequently asked
How many people live in St. Clair County, Illinois?
St. Clair County, Illinois has about 257,400 residents according to the 2020 American Community Survey.
What is the median household income in St. Clair County, Illinois?
The typical household in St. Clair County, Illinois earns about $57,473 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 $134,800, and the typical rent is about $881 a month.
How educated are people in St. Clair County, Illinois?
About 29.0% 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 14.4% 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 5,452 residents, a change of about -2 percent over that period.
Keep going
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