Piatt County Demographics

A map of Piatt County's Population by Race

Piatt County, Illinois has an estimated population of 16,695, a less than 1% change from the 16,673 recorded in the 2020 Census. The population is 94.8% White, 1.6% Hispanic, 1.6% Multiracial, 1.2% Black, 0.6% Asian, and 0.2% Native American/Other. This demographic dot map shows the population of Piatt County, with one dot drawn for each person counted by the Census, color-coded by race.

Piatt 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 Piatt County, that probability was 12.3% in 2020 and 10.1% in the most recent ACS estimates.

Piatt County is ranked the 63rd most populous county in Illinois, out of 102 counties. Piatt County was ranked the 65th most populous county in the 2020 Census.

Piatt County's White Population

15,823 residents of Piatt County, or 94.8% of the population, identify as White. The share of White residents in Piatt County is significantly higher than in Illinois overall, where 58.1% of the population is White. Piatt County ranks 23rd statewide in terms of White residents as a share of the population, out of 102 counties.

Since the 2020 Census, Piatt County's White population has grown by an estimated 1.4%. White residents' share of Piatt County's population has increased from 93.6% to 94.8%.

Piatt County is more White than neighboring De Witt County (92.7% White), Macon County (73.3% White), Champaign County (62.4% White), and Douglas County (87.4% White). Piatt County is less White than neighboring Moultrie County (95.1% White).

Piatt County's Black Population

206 residents of Piatt County, or 1.2% of the population, identify as Black. The share of Black residents in Piatt County is considerably lower than in Illinois overall, where 13.3% of the population is Black. Piatt County ranks 77th statewide in terms of Black residents as a share of the population, out of 102 counties.

Since the 2020 Census, Piatt County's Black population has grown by an estimated 148.2%. Black residents' share of Piatt County's population has increased from 0.5% to 1.2%.

Piatt County is more Black than neighboring De Witt County (1% Black), and Moultrie County (1% Black). Piatt County is less Black than neighboring Macon County (16.2% Black), and Champaign County (13.4% Black).

Piatt County's Asian Population

106 residents of Piatt County, or 0.6% of the population, identify as Asian. The share of Asian residents in Piatt County is lower than in Illinois overall, where 5.9% of the population is Asian. Piatt County ranks 52nd statewide in terms of Asian residents as a share of the population, out of 102 counties.

Since the 2020 Census, Piatt County's Asian population has grown by an estimated 32.5%. Asian residents' share of Piatt County's population has remained roughly unchanged at 0.6%.

Piatt County is more Asian than neighboring De Witt County (0.2% Asian), Moultrie County (0.1% Asian), and Douglas County (0.4% Asian). Piatt County is less Asian than neighboring Macon County (1.5% Asian), and Champaign County (11.4% Asian).

Piatt County's Hispanic Population

271 residents of Piatt County, or 1.6% of the population, identify as Hispanic. The share of Hispanic residents in Piatt County is significantly lower than in Illinois overall, where 18.8% of the population is Hispanic. Piatt County ranks 86th statewide in terms of Hispanic residents as a share of the population, out of 102 counties.

Since the 2020 Census, Piatt County's Hispanic population has grown by an estimated 9.7%. Hispanic residents' share of Piatt County's population has remained roughly unchanged at 1.6%.

Piatt County is less Hispanic than neighboring De Witt County (3.5% Hispanic), Moultrie County (1.7% Hispanic), Macon County (2.9% Hispanic), Champaign County (8.3% Hispanic), and Douglas County (8.5% Hispanic).

Piatt County's Native American/Other Population

27 residents of Piatt 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 Piatt County is comparable to the share in Illinois overall, where 0.5% of the population is Native American/Other. Piatt County ranks 41st statewide in terms of Native American/Other residents as a share of the population, out of 102 counties.

Since the 2020 Census, Piatt County's Native American/Other population has declined by an estimated 64.0%. Native American/Other residents' share of Piatt County's population has remained roughly unchanged at 0.2%.

Piatt County is more Native American/Other than neighboring Moultrie County (0.1% Native American/Other). Piatt County is less Native American/Other than neighboring Macon County (0.5% Native American/Other), Champaign County (0.4% Native American/Other), and Douglas County (0.4% Native American/Other).

Piatt County's Multiracial Population

262 residents of Piatt County, or 1.6% of the population, identify as Multiracial. The share of Multiracial residents in Piatt County is comparable to the share in Illinois overall, where 3.4% of the population is Multiracial. Piatt County ranks 42nd statewide in terms of Multiracial residents as a share of the population, out of 102 counties.

Since the 2020 Census, Piatt County's Multiracial population has declined by an estimated 55.4%. Multiracial residents' share of Piatt County's population has decreased from 3.5% to 1.6%.

Piatt County is less Multiracial than neighboring De Witt County (2.3% Multiracial), Moultrie County (2.1% Multiracial), Macon County (5.6% Multiracial), Champaign County (4.1% Multiracial), and Douglas County (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.