Grundy County Demographics

A map of Grundy County's Population by Race

Grundy County, Illinois has an estimated population of 53,219, a slight increase from the 52,533 recorded in the 2020 Census. The population is 82.4% White, 12.0% Hispanic, 2.4% Multiracial, 2.3% Black, 0.6% Asian, and 0.3% Native American/Other. This demographic dot map shows the population of Grundy County, with one dot drawn for each person counted by the Census, color-coded by race.

Grundy is about as racially diverse as it was in 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 Grundy County, that probability was 30.2% in 2020 and 30.5% in the most recent ACS estimates.

Grundy County is ranked the 26th most populous county in Illinois, out of 102 counties. Grundy County was ranked the 27th most populous county in the 2020 Census.

Grundy County's White Population

43,879 residents of Grundy County, or 82.4% of the population, identify as White. The share of White residents in Grundy County is significantly higher than in Illinois overall, where 58.1% of the population is White. Grundy County ranks 71st statewide in terms of White residents as a share of the population, out of 102 counties.

Since the 2020 Census, Grundy County's White population has remained roughly the same. White residents' share of Grundy County's population has remained roughly unchanged at 82.4%.

Grundy County is more White than neighboring Kendall County (62% White), Will County (58.6% White), LaSalle County (82.1% White), and Kankakee County (68% White). Grundy County is less White than neighboring Livingston County (87.7% White).

Grundy County's Black Population

1,213 residents of Grundy County, or 2.3% of the population, identify as Black. The share of Black residents in Grundy County is considerably lower than in Illinois overall, where 13.3% of the population is Black. Grundy County ranks 54th statewide in terms of Black residents as a share of the population, out of 102 counties.

Since the 2020 Census, Grundy County's Black population has grown by an estimated 45.6%. Black residents' share of Grundy County's population has increased from 1.6% to 2.3%.

Grundy County is less Black than neighboring Kendall County (7.6% Black), Livingston County (3.4% Black), Will County (11.6% Black), LaSalle County (2.5% Black), and Kankakee County (14.3% Black).

Grundy County's Asian Population

301 residents of Grundy County, or 0.6% of the population, identify as Asian. The share of Asian residents in Grundy County is lower than in Illinois overall, where 5.9% of the population is Asian. Grundy County ranks 30th statewide in terms of Asian residents as a share of the population, out of 102 counties.

Since the 2020 Census, Grundy County's Asian population has declined by an estimated 35.4%. Asian residents' share of Grundy County's population has remained roughly unchanged at 0.6%.

Grundy County is less Asian than neighboring Kendall County (3.5% Asian), Will County (6.3% Asian), LaSalle County (0.8% Asian), and Kankakee County (1% Asian).

Grundy County's Hispanic Population

6,368 residents of Grundy County, or 12.0% of the population, identify as Hispanic. The share of Hispanic residents in Grundy County is lower than in Illinois overall, where 18.8% of the population is Hispanic. Grundy County ranks 16th statewide in terms of Hispanic residents as a share of the population, out of 102 counties.

Since the 2020 Census, Grundy County's Hispanic population has grown by an estimated 11.5%. Hispanic residents' share of Grundy County's population has increased from 10.9% to 12.0%.

Grundy County is more Hispanic than neighboring Livingston County (5.8% Hispanic), and LaSalle County (11.2% Hispanic). Grundy County is less Hispanic than neighboring Kendall County (22.4% Hispanic), Will County (19.8% Hispanic), and Kankakee County (12.7% Hispanic).

Grundy County's Native American/Other Population

163 residents of Grundy County, or 0.3% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Grundy County is comparable to the share in Illinois overall, where 0.5% of the population is Native American/Other. Grundy County ranks 72nd statewide in terms of Native American/Other residents as a share of the population, out of 102 counties.

Since the 2020 Census, Grundy County's Native American/Other population has declined by an estimated 12.4%. Native American/Other residents' share of Grundy County's population has remained roughly unchanged at 0.3%.

Grundy County is more Native American/Other than neighboring Livingston County (0.2% Native American/Other). Grundy County is less Native American/Other than neighboring Kendall County (0.5% Native American/Other), Will County (0.4% Native American/Other), and Kankakee County (0.4% Native American/Other).

Grundy County's Multiracial Population

1,295 residents of Grundy County, or 2.4% of the population, identify as Multiracial. The share of Multiracial residents in Grundy County is comparable to the share in Illinois overall, where 3.4% of the population is Multiracial. Grundy County ranks 41st statewide in terms of Multiracial residents as a share of the population, out of 102 counties.

Since the 2020 Census, Grundy County's Multiracial population has declined by an estimated 30.5%. Multiracial residents' share of Grundy County's population has decreased from 3.5% to 2.4%.

Grundy County is less Multiracial than neighboring Kendall County (3.9% Multiracial), Will County (3.4% Multiracial), LaSalle County (3.1% Multiracial), and Kankakee County (3.7% 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.