St. Clair County, Illinois Population 2019

St. Clair County, Illinois's estimated population is 262,426 with a growth rate of -0.26% in the past year according to the most recent United States census data. St. Clair County, Illinois is the 9th largest county in Illinois.

Year Population Growth Growth Rate
2018261,059-1,367-0.52%
2017262,426-676-0.26%
2016263,102-1,703-0.64%
2015264,805-1,117-0.42%
2014265,922-883-0.33%
2013266,805-1,841-0.69%
2012268,646-1,360-0.50%
2011270,006-336-0.12%
2010270,3427,4902.85%
1990262,852-4,679-1.75%
1980267,531-17,645-6.19%
1970285,17622,6678.63%
1960262,50956,51427.43%
1950205,99539,09623.42%
1940166,8999,1245.78%
1930157,77521,25515.57%
1920136,52016,65013.89%
1910119,87033,18538.28%
190086,68520,11430.21%
189066,5714,7657.71%
188061,80610,73821.03%
187051,06813,37435.48%
186037,69417,51486.79%
185020,1806,54948.04%
184013,6316,55392.58%
18307,0781,82534.74%
18205,2532464.91%
18105,0073,652269.52%
18001,3550.00%

St. Clair County, Illinois Population Growth

Population Data via

Population by Race

Race Population
White170,540
Black or African American79,010
Two or More Races7,684
Asian3,689
Some Other Race2,900
American Indian and Alaska Native537
Native Hawaiian and Other Pacific Islander73

St. Clair County, Illinois Population Pyramid 2019

St. Clair County, Illinois Median Age

38


Total

36.4


Male

39.6


Female

St. Clair County, Illinois Adults

There are 201,247 adults, (37,862 of whom are seniors) in St. Clair County, Illinois.

St. Clair County, Illinois Age Dependency

61.8

Age Dependency Ratio

23.2

Old Age Dependency Ratio

38.7

Child Dependency Ratio

St. Clair County, Illinois Sex Ratio

Female

136,784

51.73%

Male

127,649

48.27%

St. Clair County, Illinois Households and Families

St. Clair County, Illinois Renter vs Owner Occupied by Household Type

St. Clair County, Illinois Household Types

Type Owner Renter
Married84.2%15.8%
All65.1%34.9%
Male62.6%37.4%
Non Family53.7%46.3%
Female38.9%61.1%

65.1%

Rate of Home Ownership

Type Count Average Size Owned
All103,1252.5365.1
Married45,1353.1484.2
Non Family36,1971.1853.7
Female16,8253.5538.9
Male4,9683.3262.6

3.17

Average Family Size

2.53

Average Household Size

5.6%

Unmarried (Opposite Sex)

0.2%

Unmarried (Same Sex)

St. Clair County, Illinois Education

Education Attained Count Percentage
Less Than 9th Grade4,5732.57%
9th to 12th Grade11,9626.73%
High School Graduate51,43828.92%
Some College43,06424.22%
Associates Degree19,52510.98%
Bachelors Degree28,05615.78%
Graduate Degree19,22110.81%

St. Clair County, Illinois Educational Attainment by Race

Name Total High School Bachelors
White118,916111,46636,197
Black48,36641,1047,883
Hispanic5,4074,1161,271
Asian2,6582,3161,169
Multiple Races2,4252,230690
Other Race1,7301,209372
Native American44636868
Islander55558

The highest rate of high school graduation is among islander people with a rate of 100.00%.

The highest rate of bachelors degrees is among asian people with a rate of 43.98%.

Name Average Male Female
Overall$37,180$43,757$31,472
Less Than High School$21,027$25,137$15,663
High School Grad$28,016$33,152$22,095
Some College$35,029$41,431$29,515
Bachelors Degree$51,167$63,833$41,694
Graduate Degree$68,223$87,872$54,389

$37,180

Average Earnings

$43,757

Average Male

$31,472

Average Female

St. Clair County, Illinois Language

St. Clair County, Illinois Language by Age

St. Clair County, Illinois Language

94.97% of St. Clair County, Illinois residents speak only English, while 5.03% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 2.53% of the population.

St. Clair County, Illinois Poverty

St. Clair County, Illinois Poverty by Race

Name Total In Poverty Poverty Rate
Black77,66027,52135.44%
White161,86313,1618.13%
Hispanic10,0501,99319.83%
Multiple7,4491,56320.98%
Other2,89474825.85%
Asian3,6623008.19%
Native53715228.31%
Islander7368.22%

17.05%

Overall Poverty Rate

15.05%

Male Poverty Rate

18.90%

Female Poverty Rate

Poverty in St. Clair County, Illinois

The race most likely to be in poverty in St. Clair County, Illinois is Black, with 35.44% below the poverty level.

The race least likely to be in poverty in St. Clair County, Illinois is White, with 8.13% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 3.14%. Among those working part-time, it was 17.86%, and for those that did not work, the poverty rate was 25.37%.

Name Poverty
Less Than High School30.62%
High School17.77%
Some College11.81%
Bachelors or Greater3.52%
Name Poverty
Female Unemployed38.06%
Male Unemployed30.31%
Female Employed9.95%
Male Employed4.36%

St. Clair County, Illinois Income

St. Clair County, Illinois Income by Household Type

Name Median Mean
Households$51,103$71,123
Families$66,898$86,848
Married Families$88,962$108,418
Non Families$28,692$38,937

St. Clair County, Illinois Marital Status

St. Clair County, Illinois Marital Status

Marriage Rates

45.6%

Overall Marriage Rate

48.5%

Male Marriage Rate

43.0%

Female Marriage Rate

St. Clair County, Illinois Married by Age and Sex

St. Clair County, Illinois Marriage

The age group where males are most likely to be married is Over 65, while the female age group most likely to be married is 45-54.

St. Clair County, Illinois Marital Status by Race

St. Clair County, Illinois Veterans

26,000

Number of Veterans

22,775

Male Veterans

3,225

Female Veterans

War Veterans
First Gulf War9,042
Vietnam8,285
Second Gulf War7,079
Korea1,675
World War II936

St. Clair County, Illinois Veterans by Race

Name Veterans % of Total
White19,66714.83%
Black5,2609.27%
Hispanic69811.07%
2 or More46113.91%
Other27614.00%
Asian2398.11%
Indian8917.55%
Hawaiian811.43%

St. Clair County, Illinois Veterans by Education

6.95%

Veteran Poverty Rate

22.58%

Veteran Disability Rate

St. Clair County, Illinois Employment Status

62.5%

Labor Force Participation

56.3%

Employment Rate

7.8%

Unemployment Rate

Population of Cities in St. Clair County, Illinois

City 2010 Census 2016 Estimated Growth Growth Rate
Belleville4435741906-2451-5.53%
O'Fallon28674290313571.25%
East St. Louis269172692250.02%
Collinsville 2555824635-923-3.61%
Fairview Heights1707816686-392-2.30%
Cahokia1523814260-978-6.42%
Swansea1345613500440.33%
Shiloh12486130115254.20%
Columbia 9685102735886.07%
Mascoutah750979634546.05%
Centreville53275035-292-5.48%
Lebanon44574433-24-0.54%
Freeburg43744234-140-3.20%
Caseyville42154017-198-4.70%
Washington Park41963955-241-5.74%
Dupo 41303887-243-5.88%
Millstadt39863878-108-2.71%
Madison 38913846-45-1.16%
Smithton37413763220.59%
New Baden 33493291-58-1.73%
Fairmont City 26292482-147-5.59%
New Athens20581934-124-6.03%
Alorton20341915-119-5.85%
Marissa19781836-142-7.18%
Brooklyn749709-40-5.34%
St. Libory609600-9-1.48%
Hecker 48648930.62%
Lenzburg518488-30-5.79%
East Carondelet503467-36-7.16%
Summerfield432398-34-7.87%
Fayetteville366340-26-7.10%
Sauget159151-8-5.03%
  1. US Census City/Town Population estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. Population of States and Counties of the United States: 1790 - 1990