St. Clair County, Illinois Citizen Voting-age Population By Race and Ethnicity in 2021 (ACS-5Yrs)

Updated on March 26, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2021, the citizen voting-age population for St. Clair County, IL was 194.04K. The Non-Hispanic White Alone ethnicity group had the highest citizen voting-age population (126.34K) and constituted 65.11% of the total.

The Non-Hispanic Black or African American Alone ethnicity group had the second highest citizen voting-age population (55.55K) and constituted 28.63% of the total. The Hispanic or Latino of All Races ethnicity group had the third highest (5.70K), constituting 2.94% of the total citizen voting-age population.

The charts and tables below shows the citizen voting-age population and percentages by race and ethnicity.

You can also see similar information for other Illinois counties, and for Illinois.

Data Source: US Census - ACS 5-Years (CVAP).

See this for other years:

St. Clair County, Illinois Citizen Voting-age Population By Race and Ethnicity in 2021

Non-Hispanic White Alone

Non-Hispanic Black Alone

Hispanic or Latino of All Races

Non-Hispanic Two Or More Races

Non-Hispanic Asian Alone

Non-Hispanic American Indian & Alaska Native Alone

Non-Hispanic Native Hawaiian & Pac. Islander Alone

St. Clair County, Illinois Citizen Voting-age Population By Race and Ethnicity in 2021

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Ethnicity	Voting-age Population	% of Voting-age Pop.
Non-Hispanic White Alone	126335	65.11
Non-Hispanic Black or African American Alone	55550	28.63
Hispanic or Latino of All Races	5695	2.94
Non-Hispanic Two Or More Races	4060	2.09
Non-Hispanic Asian Alone	2220	1.14
Non-Hispanic American Indian and Alaska Native Alone	175	0.09
Non-Hispanic Native Hawaiian And Pacific Islander Alone	10	0.01