Monmouth, IL Demographics

A map of Monmouth's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	6,045	6,122	70.4%	68.8%
Hispanic	1,549	1,586	18.1%	17.8%
Black	382	537	4.5%	6.0%
Asian	355	300	4.1%	3.4%
Multiracial	174	310	2.0%	3.5%
Native American/Other	76	47	0.9%	0.5%

Monmouth, Illinois has an estimated population of 8,581, a decrease from the 8,902 recorded in the 2020 Census. The population is 70.4% White, 18.1% Hispanic, 4.5% Black, 4.1% Asian, 2.0% Multiracial, and 0.9% Native American/Other. 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 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 Monmouth, that probability was 48.9% in 2020 and 46.7% in the most recent ACS estimates.

Monmouth is ranked the 253rd 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). Monmouth was ranked the 244th most populous place in the 2020 Census.

Monmouth's White Population

6,045 residents of Monmouth, or 70.4% of the population, identify as White. The share of White residents in Monmouth is considerably higher than in Illinois overall, where 58.1% of the population is White. Monmouth ranks 1243rd statewide in terms of White residents as a share of the population, out of 1,461 places.

Since the 2020 Census, Monmouth's White population has declined by an estimated 1.3%. White residents' share of Monmouth's population has increased from 68.8% to 70.4%.

Monmouth is less White than neighboring Kirkwood (92.6% White), Cameron (100% White), Little York (95.8% White), Alexis (96.3% White), and Roseville (92.7% White).

Monmouth's Black Population

382 residents of Monmouth, or 4.5% of the population, identify as Black. The share of Black residents in Monmouth is lower than in Illinois overall, where 13.3% of the population is Black. Monmouth ranks 196th statewide in terms of Black residents as a share of the population, out of 1,461 places.

Since the 2020 Census, Monmouth's Black population has declined by an estimated 28.9%. Black residents' share of Monmouth's population has decreased from 6.0% to 4.5%.

Monmouth is more Black than neighboring Kirkwood (0% Black), Cameron (0% Black), Little York (0% Black), Alexis (0.6% Black), and Roseville (0% Black).

Monmouth's Asian Population

355 residents of Monmouth, or 4.1% of the population, identify as Asian. The share of Asian residents in Monmouth is comparable to the share in Illinois overall, where 5.9% of the population is Asian. Monmouth ranks 162nd statewide in terms of Asian residents as a share of the population, out of 1,461 places.

Since the 2020 Census, Monmouth's Asian population has grown by an estimated 18.3%. Asian residents' share of Monmouth's population has increased from 3.4% to 4.1%.

Monmouth is more Asian than neighboring Kirkwood (2% Asian), Cameron (0% Asian), Little York (0% Asian), Alexis (0.1% Asian), and Roseville (0.7% Asian).

Monmouth's Hispanic Population

1,549 residents of Monmouth, or 18.1% of the population, identify as Hispanic. The share of Hispanic residents in Monmouth is comparable to the share in Illinois overall, where 18.8% of the population is Hispanic. Monmouth ranks 131st statewide in terms of Hispanic residents as a share of the population, out of 1,461 places.

Since the 2020 Census, Monmouth's Hispanic population has declined by an estimated 2.3%. Hispanic residents' share of Monmouth's population has remained roughly unchanged at 18.1%.

Monmouth is more Hispanic than neighboring Kirkwood (3.7% Hispanic), Cameron (0% Hispanic), Little York (0% Hispanic), Alexis (1% Hispanic), and Roseville (2.4% Hispanic).

Monmouth's Native American/Other Population

76 residents of Monmouth, or 0.9% 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 Illinois overall, where 0.5% of the population is Native American/Other. Monmouth ranks 478th statewide in terms of Native American/Other residents as a share of the population, out of 1,461 places.

Since the 2020 Census, Monmouth's Native American/Other population has grown by an estimated 61.7%. Native American/Other residents' share of Monmouth's population has remained roughly unchanged at 0.9%.

Monmouth is more Native American/Other than neighboring Kirkwood (0% Native American/Other), Cameron (0% Native American/Other), Little York (0% Native American/Other), and Alexis (0% Native American/Other). Monmouth is less Native American/Other than neighboring Roseville (2.6% Native American/Other).

Monmouth's Multiracial Population

174 residents of Monmouth, or 2.0% of the population, identify as Multiracial. The share of Multiracial residents in Monmouth is comparable to the share in Illinois overall, where 3.4% of the population is Multiracial. Monmouth ranks 736th statewide in terms of Multiracial residents as a share of the population, out of 1,461 places.

Since the 2020 Census, Monmouth's Multiracial population has declined by an estimated 43.9%. Multiracial residents' share of Monmouth's population has decreased from 3.5% to 2.0%.

Monmouth is more Multiracial than neighboring Kirkwood (1.7% Multiracial), Cameron (0% Multiracial), and Roseville (1.6% Multiracial). Monmouth is less Multiracial than neighboring Little York (4.2% 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.