Marengo, IA Demographics

A map of Marengo's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	2,586	2,223	94.9%	91.3%
Multiracial	78	86	2.9%	3.5%
Black	31	6	1.1%	0.2%
Native American/Other	22	11	0.8%	0.5%
Hispanic	8	99	0.3%	4.1%
Asian	0	10	0.0%	0.4%

Marengo, Iowa has an estimated population of 2,725, a large increase from the 2,435 recorded in the 2020 Census. The population is 94.9% White, 2.9% Multiracial, 1.1% Black, 0.8% Native American/Other, 0.3% Hispanic, and 0.0% Asian. 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 Iowa 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 16.4% in 2020 and 9.8% in the most recent ACS estimates.

Marengo is ranked the 132nd most populous place in Iowa, out of 1,026 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 145th most populous place in the 2020 Census.

Marengo's White Population

2,586 residents of Marengo, or 94.9% of the population, identify as White. The share of White residents in Marengo is considerably higher than in Iowa overall, where 82.3% of the population is White. Marengo ranks 665th statewide in terms of White residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Marengo's White population has grown by an estimated 16.3%. White residents' share of Marengo's population has increased from 91.3% to 94.9%.

Marengo is more White than neighboring West Amana (92.7% White), Blairstown (90.4% White), and Ladora (88.3% White). Marengo is less White than neighboring Conroy (100% White), and South Amana (100% White).

Marengo's Black Population

31 residents of Marengo, or 1.1% of the population, identify as Black. The share of Black residents in Marengo is slightly lower than in Iowa overall, where 3.8% of the population is Black. Marengo ranks 522nd statewide in terms of Black residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Marengo's Black population has grown by an estimated 416.7%. Black residents' share of Marengo's population has increased from 0.2% to 1.1%.

Marengo is more Black than neighboring Conroy (0% Black), West Amana (0% Black), South Amana (0% Black), Blairstown (0% Black), and Ladora (0% Black).

Marengo's Asian Population

0 residents of Marengo, or 0.0% of the population, identify as Asian. The share of Asian residents in Marengo is slightly lower than in Iowa overall, where 2.5% of the population is Asian. Marengo ranks 325th statewide in terms of Asian residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Marengo's Asian population has declined by an estimated 100.0%. Asian residents' share of Marengo's population has remained roughly unchanged at 0.0%.

Marengo is less Asian than neighboring Blairstown (1.2% Asian).

Marengo's Hispanic Population

8 residents of Marengo, or 0.3% of the population, identify as Hispanic. The share of Hispanic residents in Marengo is lower than in Iowa overall, where 7.3% of the population is Hispanic. Marengo ranks 289th statewide in terms of Hispanic residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Marengo's Hispanic population has declined by an estimated 91.9%. Hispanic residents' share of Marengo's population has decreased from 4.1% to 0.3%.

Marengo is more Hispanic than neighboring Conroy (0% Hispanic), West Amana (0% Hispanic), and South Amana (0% Hispanic). Marengo is less Hispanic than neighboring Blairstown (6.7% Hispanic), and Ladora (2.9% Hispanic).

Marengo's Native American/Other Population

22 residents of Marengo, or 0.8% 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 Iowa overall, where 0.6% of the population is Native American/Other. Marengo ranks 376th statewide in terms of Native American/Other residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Marengo's Native American/Other population has grown by an estimated 100.0%. Native American/Other residents' share of Marengo's population has remained roughly unchanged at 0.8%.

Marengo is more Native American/Other than neighboring Conroy (0% Native American/Other), South Amana (0% Native American/Other), Blairstown (0% Native American/Other), and Ladora (0% Native American/Other). Marengo is less Native American/Other than neighboring West Amana (7.3% Native American/Other).

Marengo's Multiracial Population

78 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 Iowa overall, where 3.5% of the population is Multiracial. Marengo ranks 279th statewide in terms of Multiracial residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Marengo's Multiracial population has declined by an estimated 9.3%. Multiracial residents' share of Marengo's population has decreased from 3.5% to 2.9%.

Marengo is more Multiracial than neighboring Conroy (0% Multiracial), West Amana (0% Multiracial), South Amana (0% Multiracial), and Blairstown (1.7% Multiracial). Marengo is less Multiracial than neighboring Ladora (8.8% 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.