Washington County Demographics
A map of Washington County's Population by Race
Washington County, Illinois has an estimated population of 13,627, a less than 1% change from the 13,761 recorded in the 2020 Census. The population is 94.8% White, 2.0% Multiracial, 1.6% Hispanic, 1.2% Black, 0.2% Asian, and 0.2% Native American/Other. This demographic dot map shows the population of Washington County, with one dot drawn for each person counted by the Census, color-coded by race.
Washington has become slightly 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 Washington County, that probability was 11.0% in 2020 and 10.0% in the most recent ACS estimates.
Washington County is ranked the 76th most populous county in Illinois, out of 102 counties. Washington County was ranked the 77th most populous county in the 2020 Census.
Washington County's White Population
12,919 residents of Washington County, or 94.8% of the population, identify as White. The share of White residents in Washington County is significantly higher than in Illinois overall, where 58.1% of the population is White. Washington County ranks 15th statewide in terms of White residents as a share of the population, out of 102 counties.
Since the 2020 Census, Washington County's White population has remained roughly the same. White residents' share of Washington County's population has increased from 94.3% to 94.8%.
Washington County is more White than neighboring Clinton County (90.1% White), Perry County (84.9% White), Jefferson County (83.6% White), Randolph County (85.1% White), and St. Clair County (59.1% White).
Washington County's Black Population
166 residents of Washington County, or 1.2% of the population, identify as Black. The share of Black residents in Washington County is considerably lower than in Illinois overall, where 13.3% of the population is Black. Washington County ranks 71st statewide in terms of Black residents as a share of the population, out of 102 counties.
Since the 2020 Census, Washington County's Black population has grown by an estimated 95.3%. Black residents' share of Washington County's population has increased from 0.6% to 1.2%.
Washington County is less Black than neighboring Clinton County (3.1% Black), Perry County (7.6% Black), Jefferson County (5.8% Black), Randolph County (8.2% Black), and St. Clair County (27.7% Black).
Washington County's Asian Population
29 residents of Washington County, or 0.2% of the population, identify as Asian. The share of Asian residents in Washington County is lower than in Illinois overall, where 5.9% of the population is Asian. Washington County ranks 55th statewide in terms of Asian residents as a share of the population, out of 102 counties.
Since the 2020 Census, Washington County's Asian population has declined by an estimated 55.4%. Asian residents' share of Washington County's population has remained roughly unchanged at 0.2%.
Washington County is less Asian than neighboring Clinton County (0.6% Asian), Perry County (0.4% Asian), Jefferson County (1% Asian), Randolph County (0.6% Asian), and St. Clair County (1.6% Asian).
Washington County's Hispanic Population
217 residents of Washington County, or 1.6% of the population, identify as Hispanic. The share of Hispanic residents in Washington County is significantly lower than in Illinois overall, where 18.8% of the population is Hispanic. Washington County ranks 81st statewide in terms of Hispanic residents as a share of the population, out of 102 counties.
Since the 2020 Census, Washington County's Hispanic population has declined by an estimated 3.1%. Hispanic residents' share of Washington County's population has remained roughly unchanged at 1.6%.
Washington County is less Hispanic than neighboring Clinton County (4.1% Hispanic), Perry County (3.7% Hispanic), Jefferson County (2.8% Hispanic), Randolph County (3.8% Hispanic), and St. Clair County (5.1% Hispanic).
Washington County's Native American/Other Population
23 residents of Washington 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 Washington County is comparable to the share in Illinois overall, where 0.5% of the population is Native American/Other. Washington County ranks 44th statewide in terms of Native American/Other residents as a share of the population, out of 102 counties.
Since the 2020 Census, Washington County's Native American/Other population has declined by an estimated 61.7%. Native American/Other residents' share of Washington County's population has remained roughly unchanged at 0.2%.
Washington County is less Native American/Other than neighboring Jefferson County (0.7% Native American/Other), Randolph County (0.4% Native American/Other), and St. Clair County (0.7% Native American/Other).
Washington County's Multiracial Population
273 residents of Washington County, or 2.0% of the population, identify as Multiracial. The share of Multiracial residents in Washington County is comparable to the share in Illinois overall, where 3.4% of the population is Multiracial. Washington County ranks 91st statewide in terms of Multiracial residents as a share of the population, out of 102 counties.
Since the 2020 Census, Washington County's Multiracial population has declined by an estimated 22.2%. Multiracial residents' share of Washington County's population has decreased from 2.6% to 2.0%.
Washington County is more Multiracial than neighboring Randolph County (1.9% Multiracial). Washington County is less Multiracial than neighboring Perry County (3.2% Multiracial), Jefferson County (6% Multiracial), and St. Clair County (5.8% 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.