St. Clair County Summary

Life in St. Clair County research summary. HomeSnacks has been researching the quality of life in St. Clair County over the past eight years using Census data, FBI crime data, cost of living data, and other primary sources. Based on the most recently available data, we found the following about life in St. Clair County:

  • The population in St. Clair County is 256,791.

  • The median home value in St. Clair County is $167,079.

  • The median income in St. Clair County is $68,915.

  • The median rent in St. Clair County is $1,002.

  • The unemployment rate in St. Clair County is 5.7%.

  • The poverty rate in St. Clair County is 13.8%.

  • The average high in St. Clair County is 74.1° and there are 103.2 inches of rainfall annually.

Cities & Towns in St. Clair County

List Of Cities & Towns in St. Clair County

Belleville, IL Population 42,155

O'Fallon, IL Population 32,104

Collinsville, IL Population 24,294

East St. Louis, IL Population 18,796

Fairview Heights, IL Population 16,360

Swansea, IL Population 14,888

Shiloh, IL Population 13,892

Columbia, IL Population 11,036

Mascoutah, IL Population 8,762

Lebanon, IL Population 4,683

Freeburg, IL Population 4,203

Millstadt, IL Population 4,035

Scott AFB, IL Population 4,023

Dupo, IL Population 3,960

Smithton, IL Population 3,909

Caseyville, IL Population 3,893

New Baden, IL Population 3,444

Madison, IL Population 2,677

Washington Park, IL Population 2,661

Fairmont City, IL Population 2,125

New Athens, IL Population 1,951

Marissa, IL Population 1,200

St. Libory, IL Population 637

Brooklyn, IL Population 629

Hecker, IL Population 540

Lenzburg, IL Population 445

Summerfield, IL Population 408

Fayetteville, IL Population 398

Sauget, IL Population 270

East Carondelet, IL Population 267

Adjuntas , IL Population 22

Adin , IL Population 0

Adona , IL Population 0

Centreville, IL Population 0

Paderborn, IL Population 0

Alorton, IL Population 0

Cahokia, IL Population 0

Map Of St. Clair County

St. Clair County, IL Weather

  • The average high in St. Clair County is 74.1°.

  • There are 79.86 nice days each year.

  • Expect an average of 103.2 inches of rain each year with 4.8 inches of snow.

  • There is an average of 5:13 hours of sun each day in St. Clair County.

StatSt. Clair County
Mean High74.1
Nice Days79.86
Rainfall103.2
Snowfall4.8
Sunny_hours5:13
74.1°
Average High
103.2
Inches of Rain

St. Clair County Photos

Greaterstl
Source: Public Domain
Birds Eye View Of Bellevillec Illinois
Source: Public Domain
Harrison Machine Works  Tractor
Source: Wikipedia User Bill Whittaker (talk) | CC BY-SA 3.0
Old Cahokia Courthouse
Source: Wikipedia User Rklawton | CC BY-SA 3.0
Greaterstl
Source: Public Domain
Collinsville Watertower
Source: Wikipedia User Tristan Denyer20:57, 21 D | GFDL

St. Clair County Demographics

Population over time in St. Clair County

The current population in St. Clair County is 256,791. The population has decreased -1.4% from 2019.

Year Population % Change
2022 258,597 -1.0%
2021 261,186 -0.4%
2020 262,338 -

Gender in St. Clair County

  • St. Clair County is 51.4% female with 131,927 female residents.

  • St. Clair County is 48.6% male with 124,863 male residents.

Female
51.4% (131,927)
Male
48.6% (124,863)
Gender St. Clair County IL USA
Female 51.4% 50.5% 50.4%
Male 48.6% 49.5% 49.6%

Race / Ethnicity in St. Clair County

St. Clair County is:

  • 60.1% White with 154,225 White residents.

  • 28.1% African American with 72,267 African American residents.

  • 0.3% American Indian with 716 American Indian residents.

  • 1.6% Asian with 3,984 Asian residents.

  • 0.0% Hawaiian with 43 Hawaiian residents.

  • 0.5% Other with 1,281 Other residents.

  • 5.0% Two Or More with 12,751 Two Or More residents.

  • 4.5% Hispanic with 11,524 Hispanic residents.

White
60.1% (154,225)
African American
28.1% (72,267)
American Indian
0.3% (716)
Asian
1.6% (3,984)
Hawaiian
0.0% (43)
Other
0.5% (1,281)
Two Or More
5.0% (12,751)
Hispanic
4.5% (11,524)

Table: St. Clair County By Race

Race St. Clair County IL USA
White 60.1% 59.6% 58.9%
African American 28.1% 13.7% 12.1%
American Indian 0.3% 0.1% 0.6%
Asian 1.6% 5.7% 5.7%
Hawaiian 0.0% 0.0% 0.2%
Other 0.5% 0.3% 0.4%
Two Or More 5.0% 2.8% 3.5%
Hispanic 4.5% 17.8% 18.7%

Household Income For St. Clair County, Illinois

  • 5.8% of households in St. Clair County earn Less than $10,000.

  • 4.0% of households in St. Clair County earn $10,000 to $14,999.

  • 7.9% of households in St. Clair County earn $15,000 to $24,999.

  • 7.7% of households in St. Clair County earn $25,000 to $34,999.

  • 11.8% of households in St. Clair County earn $35,000 to $49,999.

  • 16.9% of households in St. Clair County earn $50,000 to $74,999.

  • 13.9% of households in St. Clair County earn $75,000 to $99,999.

  • 15.7% of households in St. Clair County earn $100,000 to $149,999.

  • 8.7% of households in St. Clair County earn $150,000 to $199,999.

  • 7.6% of households in St. Clair County earn $200,000 or more.

Less than $10,000
5.8% (14,978)
$10,000 to $14,999
4.0% (10,299)
$15,000 to $24,999
7.9% (20,280)
$25,000 to $34,999
7.7% (19,839)
$35,000 to $49,999
11.8% (30,279)
$50,000 to $74,999
16.9% (43,279)
$75,000 to $99,999
13.9% (35,662)
$100,000 to $149,999
15.7% (40,336)
$150,000 to $199,999
8.7% (22,254)
$200,000 or more
7.6% (19,581)
Income St. Clair County IL USA
Less than $10,000 5.8% 5.3% 4.9%
$10,000 to $14,999 4.0% 3.5% 3.8%
$15,000 to $24,999 7.9% 6.7% 7.0%
$25,000 to $34,999 7.7% 7.1% 7.4%
$35,000 to $49,999 11.8% 10.1% 10.7%
$50,000 to $74,999 16.9% 15.4% 16.1%
$75,000 to $99,999 13.9% 12.9% 12.8%
$100,000 to $149,999 15.7% 17.6% 17.1%
$150,000 to $199,999 8.7% 9.4% 8.8%
$200,000 or more 7.6% 12.1% 11.4%

Highest level of educational attainment in St. Clair County for adults over 25

  • 3.0% of adults in St. Clair County completed < 9th grade.

  • 5.0% of adults in St. Clair County completed 9-12th grade.

  • 27.0% of adults in St. Clair County completed high school / ged.

  • 24.0% of adults in St. Clair County completed some college.

  • 11.0% of adults in St. Clair County completed associate's degree.

  • 18.0% of adults in St. Clair County completed bachelor's degree.

  • 10.0% of adults in St. Clair County completed master's degree.

  • 1.0% of adults in St. Clair County completed professional degree.

  • 1.0% of adults in St. Clair County completed doctorate degree.

< 9th Grade
3% (7,703)
9-12th Grade
5% (12,839)
High School / GED
27% (69,333)
Some College
24% (61,629)
Associate's Degree
11% (28,247)
Bachelor's Degree
18% (46,222)
Master's Degree
10% (25,679)
Professional Degree
1% (2,567)
Doctorate Degree
1% (2,567)
Education St. Clair County IL USA
< 9th Grade 3% 6% 3%
9-12th Grade 5% 5% 6%
High School / GED 27% 25% 26%
Some College 24% 20% 20%
Associate's Degree 11% 8% 9%
Bachelor's Degree 18% 22% 21%
Master's Degree 10% 11% 10%
Professional Degree 1% 2% 2%
Doctorate Degree 1% 1% 2%

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