Marengo, IL Demographics

A map of Marengo's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	6,007	5,758	85.3%	76.1%
Hispanic	798	1,381	11.3%	18.2%
Multiracial	202	248	2.9%	3.3%
Black	29	94	0.4%	1.2%
Asian	4	51	0.1%	0.7%
Native American/Other	0	36	0.0%	0.5%

Marengo, Illinois has an estimated population of 7,040, a decrease from the 7,568 recorded in the 2020 Census. The population is 85.3% White, 11.3% Hispanic, 2.9% Multiracial, 0.4% Black, 0.1% Asian, and 0.0% Native American/Other. This demographic dot map shows the population of Marengo, with one dot drawn for each person counted by the Census, color-coded by race.

Marengo has become considerably 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 Marengo, that probability was 38.6% in 2020 and 25.8% in the most recent ACS estimates.

Marengo is ranked the 282nd most populous place in Illinois, out of 1,461 places. This ranking is based on the Census definition of a place, which includes incorporated places like cities, towns, and villages, as well as unincorporated census-designated places (CDPs). Marengo was ranked the 275th most populous place in the 2020 Census.

Marengo's White Population

6,007 residents of Marengo, or 85.3% of the population, identify as White. The share of White residents in Marengo is significantly higher than in Illinois overall, where 58.1% of the population is White. Marengo ranks 1174th statewide in terms of White residents as a share of the population, out of 1,461 places.

Since the 2020 Census, Marengo's White population has grown by an estimated 4.3%. White residents' share of Marengo's population has increased from 76.1% to 85.3%.

Marengo is more White than neighboring Riley (0% White), Coral (0% White), Garden Prairie (78.7% White), and Franklinville (0% White). Marengo is less White than neighboring Union (90.5% White).

Marengo's Black Population

29 residents of Marengo, or 0.4% of the population, identify as Black. The share of Black residents in Marengo is considerably lower than in Illinois overall, where 13.3% of the population is Black. Marengo ranks 504th statewide in terms of Black residents as a share of the population, out of 1,461 places.

Since the 2020 Census, Marengo's Black population has declined by an estimated 69.1%. Black residents' share of Marengo's population has decreased from 1.2% to 0.4%.

Marengo is more Black than neighboring Riley (0% Black), Coral (0% Black), Garden Prairie (0% Black), and Franklinville (0% Black). Marengo is less Black than neighboring Union (0.8% Black).

Marengo's Asian Population

4 residents of Marengo, or 0.1% of the population, identify as Asian. The share of Asian residents in Marengo is lower than in Illinois overall, where 5.9% of the population is Asian. Marengo ranks 506th statewide in terms of Asian residents as a share of the population, out of 1,461 places.

Since the 2020 Census, Marengo's Asian population has declined by an estimated 92.2%. Asian residents' share of Marengo's population has decreased from 0.7% to 0.1%.

Marengo is more Asian than neighboring Riley (0% Asian), Coral (0% Asian), and Franklinville (0% Asian). Marengo is less Asian than neighboring Union (2.1% Asian), and Garden Prairie (10.2% Asian).

Marengo's Hispanic Population

798 residents of Marengo, or 11.3% of the population, identify as Hispanic. The share of Hispanic residents in Marengo is lower than in Illinois overall, where 18.8% of the population is Hispanic. Marengo ranks 125th statewide in terms of Hispanic residents as a share of the population, out of 1,461 places.

Since the 2020 Census, Marengo's Hispanic population has declined by an estimated 42.2%. Hispanic residents' share of Marengo's population has decreased from 18.2% to 11.3%.

Marengo is more Hispanic than neighboring Riley (0% Hispanic), Coral (0% Hispanic), Union (5.4% Hispanic), Garden Prairie (0% Hispanic), and Franklinville (0% Hispanic).

Marengo's Native American/Other Population

0 residents of Marengo, or 0.0% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Marengo is comparable to the share in Illinois overall, where 0.5% of the population is Native American/Other. Marengo ranks 565th statewide in terms of Native American/Other residents as a share of the population, out of 1,461 places.

Since the 2020 Census, Marengo's Native American/Other population has declined by an estimated 100.0%. Native American/Other residents' share of Marengo's population has decreased from 0.5% to 0.0%.

Marengo is less Native American/Other than neighboring Garden Prairie (11.2% Native American/Other).

Marengo's Multiracial Population

202 residents of Marengo, or 2.9% of the population, identify as Multiracial. The share of Multiracial residents in Marengo is comparable to the share in Illinois overall, where 3.4% of the population is Multiracial. Marengo ranks 822nd statewide in terms of Multiracial residents as a share of the population, out of 1,461 places.

Since the 2020 Census, Marengo's Multiracial population has declined by an estimated 18.5%. Multiracial residents' share of Marengo's population has remained roughly unchanged at 2.9%.

Marengo is more Multiracial than neighboring Riley (0% Multiracial), Coral (0% Multiracial), Union (1.1% Multiracial), Garden Prairie (0% Multiracial), and Franklinville (0% 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.