Monmouth, IA Demographics

A map of Monmouth's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	121	122	100.0%	94.6%
Black	0	0	0.0%	0.0%
Asian	0	0	0.0%	0.0%
Hispanic	0	2	0.0%	1.6%
Native American/Other	0	0	0.0%	0.0%
Multiracial	0	5	0.0%	3.9%

Monmouth, Iowa has an estimated population of 121, a decrease from the 129 recorded in the 2020 Census. The population is 100.0% White, 0.0% Black, 0.0% Asian, 0.0% Hispanic, 0.0% Native American/Other, and 0.0% Multiracial. This demographic dot map shows the population of Monmouth, with one dot drawn for each person counted by the Census, color-coded by race.

Monmouth 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 Monmouth, that probability was 10.4% in 2020 and 0.0% in the most recent ACS estimates.

Monmouth is ranked the 823rd 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). Monmouth was ranked the 803rd most populous place in the 2020 Census.

Monmouth's White Population

121 residents of Monmouth, or 100.0% of the population, identify as White. The share of White residents in Monmouth is significantly higher than in Iowa overall, where 82.3% of the population is White. Monmouth ranks 334th statewide in terms of White residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Monmouth's White population has remained roughly the same. White residents' share of Monmouth's population has increased from 94.6% to 100.0%.

Monmouth is more White than neighboring Baldwin (94.1% White), Oxford Junction (97.6% White), Wyoming (90.5% White), Lost Nation (92.3% White), and Onslow (90.8% White).

Monmouth's Black Population

0 residents of Monmouth, or 0.0% of the population, identify as Black. The share of Black residents in Monmouth is slightly lower than in Iowa overall, where 3.8% of the population is Black. Monmouth ranks 600th statewide in terms of Black residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Monmouth's Black population has grown from 0 to an estimated 0. Black residents' share of Monmouth's population has remained roughly unchanged at 0.0%.

Monmouth is less Black than neighboring Lost Nation (0.8% Black), and Onslow (4.6% Black).

Monmouth's Asian Population

0 residents of Monmouth, or 0.0% of the population, identify as Asian. The share of Asian residents in Monmouth is slightly lower than in Iowa overall, where 2.5% of the population is Asian. Monmouth ranks 543rd statewide in terms of Asian residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Monmouth's Asian population has grown from 0 to an estimated 0. Asian residents' share of Monmouth's population has remained roughly unchanged at 0.0%.

Monmouth is less Asian than neighboring Lost Nation (0.8% Asian).

Monmouth's Hispanic Population

0 residents of Monmouth, or 0.0% of the population, identify as Hispanic. The share of Hispanic residents in Monmouth is lower than in Iowa overall, where 7.3% of the population is Hispanic. Monmouth ranks 714th statewide in terms of Hispanic residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Monmouth's Hispanic population has declined by an estimated 100.0%. Hispanic residents' share of Monmouth's population has decreased from 1.6% to 0.0%.

Monmouth is less Hispanic than neighboring Wyoming (4.6% Hispanic), and Onslow (2.8% Hispanic).

Monmouth's Native American/Other Population

0 residents of Monmouth, 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 Monmouth is comparable to the share in Iowa overall, where 0.6% of the population is Native American/Other. Monmouth ranks 637th statewide in terms of Native American/Other residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Monmouth's Native American/Other population has grown from 0 to an estimated 0. Native American/Other residents' share of Monmouth's population has remained roughly unchanged at 0.0%.

Monmouth is less Native American/Other than neighboring Wyoming (0.4% Native American/Other), Lost Nation (1% Native American/Other), and Onslow (1.8% Native American/Other).

Monmouth's Multiracial Population

0 residents of Monmouth, or 0.0% of the population, identify as Multiracial. The share of Multiracial residents in Monmouth is slightly lower than in Iowa overall, where 3.5% of the population is Multiracial. Monmouth ranks 225th statewide in terms of Multiracial residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Monmouth's Multiracial population has declined by an estimated 100.0%. Multiracial residents' share of Monmouth's population has decreased from 3.9% to 0.0%.

Monmouth is less Multiracial than neighboring Baldwin (5.9% Multiracial), Oxford Junction (2.4% Multiracial), Wyoming (4.6% Multiracial), and Lost Nation (5.1% 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.