St. Clair County, Illinois Citizen Voting-age Population By Race and Ethnicity in 2018 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2018, the citizen voting-age population for St. Clair County, IL was 197.31K. The Non-Hispanic White Alone ethnicity group had the highest citizen voting-age population (129.93K) and constituted 65.85% of the total.

The Non-Hispanic Black or African American Alone ethnicity group had the second highest citizen voting-age population (57.13K) and constituted 28.95% of the total. The Hispanic or Latino of All Races ethnicity group had the third highest (5.10K), constituting 2.58% 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 2018

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 2018

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Ethnicity	Voting-age Population	% of Voting-age Pop.
Non-Hispanic White Alone	129925	65.85
Non-Hispanic Black or African American Alone	57125	28.95
Hispanic or Latino of All Races	5095	2.58
Non-Hispanic Two Or More Races	2720	1.38
Non-Hispanic Asian Alone	2085	1.06
Non-Hispanic American Indian and Alaska Native Alone	305	0.16
Non-Hispanic Native Hawaiian And Pacific Islander Alone	55	0.03