Population By Race and Ethnicity in St Clair, IL in 2021

Updated on June 16, 2025.

Based on the US Census Vintage data estimates, in 2021, the 254,958 population of St Clair County, Illinois comprised of 12,611 people who identified as Hispanic (4.95%), and 242,347 people who identified as Non-Hispanic (95.05%).

Race: The White Alone population was the largest racial group in St Clair County, Illinois with a population of 164,309 (64.45%); Black or African American Alone population was the second largest racial group with a population of 78,265 (30.7%); and Two Or More Races was the third largest racial group with a population of 7,153 (2.81%).

Ethnicity: The White Alone - Non Hispanic population was the largest ethnic group in St Clair County, Illinois in 2021, with a population of 153,905 (60.37%); the second largest ethnic group was Black or African American Alone - Non Hispanic with a population of 77,349 (30.34%); and the third largest ethnic group was White Alone - Hispanic with a population of 10,404 (4.08%).

The charts and tables below shows the population and percentage of each racial and ethnicity group in St Clair, Illinois.

You can find similar information for other Illinois counties, and for Illinois.

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Hispanics and Non Hispanics in St Clair, IL in 2021
Total Population:
Race in St Clair, IL in 2021
Total Population:
Ethnicity in St Clair, IL in 2021
Total Population:
Population By Race in St Clair , IL in 2021
Race Population Percentage
Black or African American Alone 78,265 30.7%
White Alone 164,309 64.45%
American Indian and Alaska Native Alone 1,004 0.39%
Asian Alone 3,980 1.56%
Native Hawaiian And Pacific Islander Alone 247 0.1%
Two Or More Races 7,153 2.81%
Population By Ethnicity in St Clair , IL in 2021
Ethnicity Population Percentage
Black or African American Alone - Hispanic 916 0.36%
White Alone - Hispanic 10,404 4.08%
American Indian and Alaska Native Alone - Hispanic 384 0.15%
Asian Alone - Hispanic 148 0.06%
Native Hawaiian And Pacific Islander Alone - Hispanic 41 0.02%
Two Or More Races - Hispanic 718 0.28%
Black or African American Alone - Non Hispanic 77,349 30.34%
White Alone - Non Hispanic 153,905 60.37%
American Indian and Alaska Native Alone - Non Hispanic 620 0.24%
Asian Alone - Non Hispanic 3,832 1.5%
Native Hawaiian And Pacific Islander Alone - Non Hispanic 206 0.08%
Two Or More Races - Non Hispanic 6,435 2.52%