United States › Illinois › St. Clair County COUNTY · 2000 CENSUS
St. Clair County Illinois · 256,082 residents · 658 sq mi
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The short version
St. Clair County is home to 256,082 people in Illinois. The typical home is worth $74,200. That trails the Illinois median by roughly 16%. About 19% of adults have finished a four-year degree. Households earn $39,148 at the median, near the US median. The population has held roughly steady since 1990.
At a glance
Lower income
below the US median
US median: $42,589
Mid-age
median age 35.3
US median: 35.2
Less educated
19% hold a bachelor's degree
US average: 24%
Stable housing
home values roughly flat, inflation adjusted
US median home: $120,530
Section 01
Population & growth from 32.2 in 1990
US average: 35.2
Population, 1990 – 2024
252K 257K 262K 267K 272K 1990 2000 2010 2020 2024 St. Clair County Age distribution, 2000
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 02
Income & economy $39,148
+11%inflation adjusted, since 1990
from $26,813 in 1990
US average: $42,589
from $11,916 in 1990
US average: $21,522
from 17.4% in 1990
US average: 12.4%
$74,200
+3%inflation adjusted, since 1990
from $54,900 in 1990
US average: $120,530
$503
−4%inflation adjusted, since 1990
from $399 in 1990
US average: $602
from 64.7% in 1990
33.0% rent
Section 04
Race & ethnicity 1990
White, non-Hispanic 71.5%(188,032)
Hispanic / Latino 1.4%(3,741)
2000
White, non-Hispanic 66.8%(171,151)
Hispanic / Latino 2.2%(5,604)
No data for the years selected.
Section 04 · Origins
Detailed origins & ancestry Detailed origin tables are available for 2024; showing 2024 data.
Hispanic origin
+ 6 more hispanic origin groups with data Asian origin
+ 2 more asian origin groups with data Ancestry
+ 45 more ancestry groups with data from 14.7% in 1990
US average: 24.4%
High school or higher
from 72.6% in 1990
US average: 80.3%
from 5.4% in 1990
US average: 8.8%
Section 06
Commute & transportation from 20.8 min in 1990
US average: 17.6
Section 07
Work & employment No data for the years selected.
Section 08
People & community No data for the years selected.
Marital status
Men 15+
Never married 30.1%(27,802)
Women 15+
Never married 25.9%(27,255)
SHARE WITHIN EACH SEX · POPULATION 15 AND OVER · 2000
Section 09
Health coverage Showing 2024 (the nearest year with coverage data).
from 11.5% in 2013
US average: 8.4%
from 53.8% in 2020
US average: 54.8%
Direct-purchase
from 11.4% in 2020
US average: 13.8%
from 18.1% in 2020
US average: 18.4%
from 22.8% in 2020
US average: 20.9%
VA health care
from 3.4% in 2020
US average: 2.2%
Any private
from 68.5% in 2020
US average: 67.1%
Any public
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)
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
Drill deeper
Places similar to St. Clair County Head to head
Compare St. Clair County to nearby counties ST. CLAIR COUNTY VS
Monroe County
Income $102,880 +163%
Home value $282,100 +280%
Population 34,840 −86%
SEE FULL COMPARISON →
ST. CLAIR COUNTY VS
St. Louis
Income $56,160 +43%
Home value $197,500 +166%
Population 278,144 +11%
SEE FULL COMPARISON →
ST. CLAIR COUNTY VS
Madison County
Income $75,793 +94%
Home value $173,000 +133%
Population 263,110 +5%
SEE FULL COMPARISON →
ST. CLAIR COUNTY VS
Clinton County
Income $86,588 +121%
Home value $192,400 +159%
Population 37,128 −85%
SEE FULL COMPARISON →
Frequently asked
How many people live in St. Clair County, Illinois? St. Clair County, Illinois has about 256,082 residents according to the 2000 Census.
What is the median household income in St. Clair County, Illinois? The typical household in St. Clair County, Illinois earns about $39,148 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 $74,200, and the typical rent is about $503 a month.
How educated are people in St. Clair County, Illinois? About 19.3% 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 14.5% 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 6,770 residents, a change of about -3 percent over that period.
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