Clinton County Demographics

A map of Clinton County's Population by Race

Clinton County, Illinois has an estimated population of 36,954, a less than 1% change from the 36,899 recorded in the 2020 Census. The population is 90.1% White, 4.1% Hispanic, 3.1% Black, 2.0% Multiracial, 0.6% Asian, and 0.2% Native American/Other. This demographic dot map shows the population of Clinton County, with one dot drawn for each person counted by the Census, color-coded by race.

Clinton has become less racially diverse since the 2020 Census. It is considerably less diverse than Illinois overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Clinton County, that probability was 20.4% in 2020 and 18.5% in the most recent ACS estimates.

Clinton County is ranked the 37th most populous county in Illinois, out of 102 counties. Clinton County was ranked the 38th most populous county in the 2020 Census.

Clinton County's White Population

33,295 residents of Clinton County, or 90.1% of the population, identify as White. The share of White residents in Clinton County is significantly higher than in Illinois overall, where 58.1% of the population is White. Clinton County ranks 48th statewide in terms of White residents as a share of the population, out of 102 counties.

Since the 2020 Census, Clinton County's White population has grown by an estimated 1.4%. White residents' share of Clinton County's population has increased from 89.0% to 90.1%.

Clinton County is more White than neighboring Bond County (85.9% White), Marion County (89.1% White), St. Clair County (59.1% White), and Perry County (84.9% White). Clinton County is less White than neighboring Washington County (94.8% White).

Clinton County's Black Population

1,147 residents of Clinton County, or 3.1% of the population, identify as Black. The share of Black residents in Clinton County is considerably lower than in Illinois overall, where 13.3% of the population is Black. Clinton County ranks 48th statewide in terms of Black residents as a share of the population, out of 102 counties.

Since the 2020 Census, Clinton County's Black population has remained roughly the same. Black residents' share of Clinton County's population has remained roughly unchanged at 3.1%.

Clinton County is more Black than neighboring Washington County (1.2% Black), and Marion County (2.9% Black). Clinton County is less Black than neighboring Bond County (6.1% Black), St. Clair County (27.7% Black), and Perry County (7.6% Black).

Clinton County's Asian Population

213 residents of Clinton County, or 0.6% of the population, identify as Asian. The share of Asian residents in Clinton County is lower than in Illinois overall, where 5.9% of the population is Asian. Clinton County ranks 54th statewide in terms of Asian residents as a share of the population, out of 102 counties.

Since the 2020 Census, Clinton County's Asian population has grown by an estimated 21.7%. Asian residents' share of Clinton County's population has remained roughly unchanged at 0.6%.

Clinton County is more Asian than neighboring Washington County (0.2% Asian), and Perry County (0.4% Asian). Clinton County is less Asian than neighboring Marion County (0.7% Asian), and St. Clair County (1.6% Asian).

Clinton County's Hispanic Population

1,512 residents of Clinton County, or 4.1% of the population, identify as Hispanic. The share of Hispanic residents in Clinton County is considerably lower than in Illinois overall, where 18.8% of the population is Hispanic. Clinton County ranks 43rd statewide in terms of Hispanic residents as a share of the population, out of 102 counties.

Since the 2020 Census, Clinton County's Hispanic population has grown by an estimated 9.0%. Hispanic residents' share of Clinton County's population has remained roughly unchanged at 4.1%.

Clinton County is more Hispanic than neighboring Washington County (1.6% Hispanic), Bond County (2% Hispanic), Marion County (2.2% Hispanic), and Perry County (3.7% Hispanic). Clinton County is less Hispanic than neighboring St. Clair County (5.1% Hispanic).

Clinton County's Native American/Other Population

59 residents of Clinton County, or 0.2% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Clinton County is comparable to the share in Illinois overall, where 0.5% of the population is Native American/Other. Clinton County ranks 35th statewide in terms of Native American/Other residents as a share of the population, out of 102 counties.

Since the 2020 Census, Clinton County's Native American/Other population has declined by an estimated 66.9%. Native American/Other residents' share of Clinton County's population has remained roughly unchanged at 0.2%.

Clinton County is less Native American/Other than neighboring Bond County (1.2% Native American/Other), Marion County (0.9% Native American/Other), and St. Clair County (0.7% Native American/Other).

Clinton County's Multiracial Population

728 residents of Clinton County, or 2.0% of the population, identify as Multiracial. The share of Multiracial residents in Clinton County is comparable to the share in Illinois overall, where 3.4% of the population is Multiracial. Clinton County ranks 63rd statewide in terms of Multiracial residents as a share of the population, out of 102 counties.

Since the 2020 Census, Clinton County's Multiracial population has declined by an estimated 38.0%. Multiracial residents' share of Clinton County's population has decreased from 3.2% to 2.0%.

Clinton County is less Multiracial than neighboring Bond County (4.2% Multiracial), Marion County (4.2% Multiracial), St. Clair County (5.8% Multiracial), and Perry County (3.2% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.