Williamson County Demographics

A map of Williamson County's Population by Race

Williamson County, Illinois had a population of 67,153 in 2020. It was 86.7% White, 4.2% Black, 1.1% Asian, 2.6% Hispanic, 0.7% Native American/Other, and 4.7% Multiracial. This map presents the population of Williamson County, with one dot drawn for each person counted in the 2020 Census, color-coded by race.

Williamson County is the 22nd most populous county of the 102 counties in Illinois.

Williamson County's White Population

58,193 residents of Williamson County identify as White, or 86.7%. This makes the White share of the population of Williamson County considerably larger than the White share of the population of Illinois (58.3% White). Of the 102 counties in Illinois, Williamson County is ranked #58 in terms of White residents as a share of the population.

Williamson County is more White than neighboring Johnson County (81.9% White), and Jackson County (70.8% White). Williamson County is less White than neighboring Franklin County (93.1% White), Saline County (89.7% White), and Union County (88.9% White).

Williamson County's Black Population

2,809 residents of Williamson County identify as Black, or 4.2%. This makes the Black share of the population of Williamson County slightly less than the Black share of the population of Illinois (13.9% Black). Of the 102 counties in Illinois, Williamson County is ranked #39 in terms of Black residents as a share of the population.

Williamson County is more Black than neighboring Franklin County (0.4% Black), Saline County (2.9% Black), and Union County (1.3% Black). Williamson County is less Black than neighboring Johnson County (10.7% Black), and Jackson County (14.2% Black).

Williamson County's Asian Population

771 residents of Williamson County identify as Asian, or 1.1%. This makes the Asian share of the population of Williamson County roughly similar to the Asian share of the population of Illinois (5.8% Asian). Of the 102 counties in Illinois, Williamson County is ranked #23 in terms of Asian residents as a share of the population.

Williamson County is more Asian than neighboring Franklin County (0.3% Asian), Johnson County (0.1% Asian), Saline County (0.5% Asian), and Union County (0.4% Asian). Williamson County is less Asian than neighboring Jackson County (3.9% Asian).

Williamson County's Hispanic Population

1,779 residents of Williamson County identify as Hispanic, or 2.6%. This makes the Hispanic share of the population of Williamson County less than the Hispanic share of the population of Illinois (18.2% Hispanic). Of the 102 counties in Illinois, Williamson County is ranked #56 in terms of Hispanic residents as a share of the population.

Williamson County is more Hispanic than neighboring Franklin County (1.7% Hispanic), and Saline County (2% Hispanic). Williamson County is less Hispanic than neighboring Johnson County (4.1% Hispanic), Union County (5% Hispanic), and Jackson County (5.4% Hispanic).

Williamson County's Native American/Other Population

446 residents of Williamson County identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other, or 0.7%. This makes the Native American/Other share of the population of Williamson County roughly similar to the Native American/Other share of the population of Illinois (0.5% Native American/Other). Of the 102 counties in Illinois, Williamson County is ranked #9 in terms of Native American/Other residents as a share of the population.

Williamson County is more Native American/Other than neighboring Franklin County (0.4% Native American/Other), Johnson County (0.3% Native American/Other), and Union County (0.5% Native American/Other).

Williamson County's Multiracial Population

3,155 residents of Williamson County identify as Multiracial, or 4.7%. This makes the Multiracial share of the population of Williamson County roughly similar to the Multiracial share of the population of Illinois (3.2% Multiracial). Of the 102 counties in Illinois, Williamson County is ranked #11 in terms of Multiracial residents as a share of the population.

Williamson County is more Multiracial than neighboring Franklin County (4% Multiracial), Johnson County (2.9% Multiracial), Saline County (4.2% Multiracial), and Union County (3.9% Multiracial). Williamson County is less Multiracial than neighboring Jackson County (5.1% Multiracial).

Source: 2020 Census State Redistricting Data and Census TIGER/Line Shapefiles.