Cass County Demographics

A map of Cass County's Population by Race

Cass County, Illinois has an estimated population of 12,784, a slight decrease from the 13,042 recorded in the 2020 Census. The population is 69.9% White, 22.9% Hispanic, 4.0% Black, 1.3% Multiracial, 1.0% Native American/Other, and 0.9% Asian. This demographic dot map shows the population of Cass County, with one dot drawn for each person counted by the Census, color-coded by race.

Cass 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 Cass County, that probability was 46.8% in 2020 and 45.7% in the most recent ACS estimates.

Cass County is ranked the 81st most populous county in Illinois, out of 102 counties. Cass County was ranked the 82nd most populous county in the 2020 Census.

Cass County's White Population

8,934 residents of Cass County, or 69.9% of the population, identify as White. The share of White residents in Cass County is considerably higher than in Illinois overall, where 58.1% of the population is White. Cass County ranks 87th statewide in terms of White residents as a share of the population, out of 102 counties.

Since the 2020 Census, Cass County's White population has declined by an estimated 1.4%. White residents' share of Cass County's population has remained roughly unchanged at 69.9%.

Cass County is less White than neighboring Morgan County (87.2% White), Scott County (95.4% White), Schuyler County (90.2% White), Mason County (94.2% White), and Menard County (94.8% White).

Cass County's Black Population

508 residents of Cass County, or 4.0% of the population, identify as Black. The share of Black residents in Cass County is lower than in Illinois overall, where 13.3% of the population is Black. Cass County ranks 32nd statewide in terms of Black residents as a share of the population, out of 102 counties.

Since the 2020 Census, Cass County's Black population has declined by an estimated 28.0%. Black residents' share of Cass County's population has decreased from 5.4% to 4.0%.

Cass County is more Black than neighboring Scott County (1% Black), Schuyler County (3.7% Black), Mason County (0.5% Black), and Menard County (0.5% Black). Cass County is less Black than neighboring Morgan County (4.9% Black).

Cass County's Asian Population

117 residents of Cass County, or 0.9% of the population, identify as Asian. The share of Asian residents in Cass County is slightly lower than in Illinois overall, where 5.9% of the population is Asian. Cass County ranks 28th statewide in terms of Asian residents as a share of the population, out of 102 counties.

Since the 2020 Census, Cass County's Asian population has remained roughly the same. Asian residents' share of Cass County's population has remained roughly unchanged at 0.9%.

Cass County is more Asian than neighboring Morgan County (0.8% Asian), Scott County (0.4% Asian), Schuyler County (0.6% Asian), Mason County (0.4% Asian), and Menard County (0.3% Asian).

Cass County's Hispanic Population

2,929 residents of Cass County, or 22.9% of the population, identify as Hispanic. The share of Hispanic residents in Cass County is slightly higher than in Illinois overall, where 18.8% of the population is Hispanic. Cass County ranks 5th statewide in terms of Hispanic residents as a share of the population, out of 102 counties.

Since the 2020 Census, Cass County's Hispanic population has grown by an estimated 5.0%. Hispanic residents' share of Cass County's population has increased from 21.4% to 22.9%.

Cass County is more Hispanic than neighboring Morgan County (2.9% Hispanic), Scott County (1.6% Hispanic), Schuyler County (2.7% Hispanic), Mason County (1.6% Hispanic), and Menard County (1.7% Hispanic).

Cass County's Native American/Other Population

132 residents of Cass County, or 1.0% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Cass County is comparable to the share in Illinois overall, where 0.5% of the population is Native American/Other. Cass County ranks 12th statewide in terms of Native American/Other residents as a share of the population, out of 102 counties.

Since the 2020 Census, Cass County's Native American/Other population has grown by an estimated 67.1%. Native American/Other residents' share of Cass County's population has remained roughly unchanged at 1.0%.

Cass County is more Native American/Other than neighboring Morgan County (0.2% Native American/Other), Scott County (0.1% Native American/Other), Schuyler County (0% Native American/Other), Mason County (0.2% Native American/Other), and Menard County (0% Native American/Other).

Cass County's Multiracial Population

164 residents of Cass County, or 1.3% of the population, identify as Multiracial. The share of Multiracial residents in Cass County is slightly lower than in Illinois overall, where 3.4% of the population is Multiracial. Cass County ranks 98th statewide in terms of Multiracial residents as a share of the population, out of 102 counties.

Since the 2020 Census, Cass County's Multiracial population has declined by an estimated 43.4%. Multiracial residents' share of Cass County's population has decreased from 2.2% to 1.3%.

Cass County is less Multiracial than neighboring Morgan County (4% Multiracial), Scott County (1.4% Multiracial), Schuyler County (2.7% Multiracial), Mason County (3.1% Multiracial), and Menard County (2.8% 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.