COUNTY · 1990 CENSUS

St. Clair County

Illinois · 262,852 residents · 657.735 sq mi

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The short version

St. Clair County has lower-than-average household income, with a median household income of $26,813. Population has held roughly steady since 2000. Median home value is $54,900.

At a glance

Lower income

below the US median

US median: $30,130

Mid-age

median age 32.2

US median: 33.0

Less educated

15% hold a bachelor's degree

US average: 20%

Stable housing

home values roughly flat, inflation adjusted

US median home: $93,722

Section 01

Population & growth

Total population

262,852

+3%vs 2000

vs 256,082 in 2000

1990 – 2025

Population density

400 / sq mi

+3%vs 2000

vs 389 / sq mi in 2000

US average: 221

Median age

32.2

−9%vs 2000

vs 35.3 in 2000

US average: 33.0

Population, 1990 – 2024

2024254K

Section 02

Income & economy

Median household income

$26,813

−10%inflation adjusted, since 2000

vs $39,148 in 2000

US average: $30,130

1990 – 2024

Per capita income

$11,916

−37%vs 2000

vs $18,932 in 2000

US average: $14,340

Poverty rate

17.4%

+2.9 ptsvs 2000

vs 14.5% in 2000

US average: 13.2%

Section 03

Housing

Median home value

$54,900

−3%inflation adjusted, since 2000

vs $74,200 in 2000

US average: $93,722

1990 – 2024

Median gross rent

$399

+5%inflation adjusted, since 2000

vs $503 in 2000

US average: $450

Owner-occupied

64.7%

−2.3 ptsvs 2000

vs 67.0% in 2000

35.3% rent

Afford Score

2.0

+8%vs 2000

vs 1.9 in 2000

1990 – 2024

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%

Diversity Score56.9%(145,602)

1990

White, non-Hispanic71.5%(188,032)

Black27.2%(71,409)

Hispanic / Latino1.4%(3,741)

Asian0.6%(1,682)

Other0.7%(1,729)

Diversity Score53.8%(141,449)

Diversity Score

−5%vs 2000

vs 57 in 2000

1990 – 2024

Section 05

Education

Bachelor's degree or higher

14.7%

−4.6 ptsvs 2000

vs 19.3% in 2000

US average: 20.3%

High school or higher

72.6%

−8.3 ptsvs 2000

vs 80.9% in 2000

US average: 75.2%

Graduate degree

5.4%

−1.8 ptsvs 2000

vs 7.2% in 2000

US average: 7.1%

Section 06

Commute & transportation

Average commute

20.8 min

+25%vs 2000

vs 16.6 min in 2000

US average: 21.9

Section 07

Work & employment

No data for the years selected.

Section 08

People & community

No data for the years selected.

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+284%

Home value$282,100+414%

Population34,840−86%

SEE FULL COMPARISON →

ST. CLAIR COUNTY VS

St. Louis

Income$56,160+109%

Home value$197,500+260%

Population278,144+11%

SEE FULL COMPARISON →

ST. CLAIR COUNTY VS

Madison County

Income$75,793+183%

Home value$173,000+215%

Population263,110+5%

SEE FULL COMPARISON →

ST. CLAIR COUNTY VS

Clinton County

Income$86,588+223%

Home value$192,400+250%

Population37,128−85%

SEE FULL COMPARISON →

Frequently asked

How many people live in St. Clair County, Illinois?

St. Clair County, Illinois has about 262,852 residents according to the 1990 Census.

What is the median household income in St. Clair County, Illinois?

The typical household in St. Clair County, Illinois earns about $26,813 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 $54,900, and the typical rent is about $399 a month.

How educated are people in St. Clair County, Illinois?

About 14.7% 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 17.4% of people in St. Clair County, Illinois live below the federal poverty line.

DATA: US CENSUS BUREAU ACS 5-YEAR + DECENNIAL CENSUS · UPDATED 2024

How we source and harmonize this data →

St. Clair County

Population & growth

Income & economy

Housing

Race & ethnicity

Education

Commute & transportation

Work & employment

People & community

Places similar to St. Clair County

Compare St. Clair County to nearby counties

How many people live in St. Clair County, Illinois?

What is the median household income in St. Clair County, Illinois?

Is St. Clair County, Illinois expensive?

How educated are people in St. Clair County, Illinois?

What is the poverty rate in St. Clair County, Illinois?

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