Monmouth County Demographics

A map of Monmouth County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	461,195	460,825	71.5%	71.6%
Hispanic	83,325	80,730	12.9%	12.5%
Black	37,374	39,178	5.8%	6.1%
Asian	34,646	36,008	5.4%	5.6%
Multiracial	23,235	21,729	3.6%	3.4%
Native American/Other	5,578	5,145	0.9%	0.8%

Monmouth County, New Jersey has an estimated population of 645,353, a less than 1% change from the 643,615 recorded in the 2020 Census. The population is 71.5% White, 12.9% Hispanic, 5.8% Black, 5.4% Asian, 3.6% Multiracial, and 0.9% Native American/Other. This demographic dot map shows the population of Monmouth County, with one dot drawn for each person counted by the Census, color-coded by race.

Monmouth is about as racially diverse as it was in the 2020 Census. It is considerably less diverse than New Jersey overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Monmouth County, that probability was 46.4% in 2020 and 46.5% in the most recent ACS estimates.

Monmouth County is ranked the 6th most populous county in New Jersey, out of 21 counties. Monmouth County was ranked the 5th most populous county in the 2020 Census.

Monmouth County's White Population

461,195 residents of Monmouth County, or 71.5% of the population, identify as White. The share of White residents in Monmouth County is significantly higher than in New Jersey overall, where 50.9% of the population is White. Monmouth County ranks 7th statewide in terms of White residents as a share of the population, out of 21 counties.

Since the 2020 Census, Monmouth County's White population has remained roughly the same. White residents' share of Monmouth County's population has remained roughly unchanged at 71.5%.

Monmouth County is more White than neighboring Richmond County (55.5% White), Middlesex County (37.5% White), Union County (35.4% White), and Kings County (36.1% White). Monmouth County is less White than neighboring Ocean County (81.1% White).

Monmouth County's Black Population

37,374 residents of Monmouth County, or 5.8% of the population, identify as Black. The share of Black residents in Monmouth County is lower than in New Jersey overall, where 12.2% of the population is Black. Monmouth County ranks 14th statewide in terms of Black residents as a share of the population, out of 21 counties.

Since the 2020 Census, Monmouth County's Black population has declined by an estimated 4.6%. Black residents' share of Monmouth County's population has remained roughly unchanged at 5.8%.

Monmouth County is more Black than neighboring Ocean County (2.9% Black). Monmouth County is less Black than neighboring Richmond County (8.8% Black), Middlesex County (9.7% Black), Union County (19.1% Black), and Kings County (26.6% Black).

Monmouth County's Asian Population

34,646 residents of Monmouth County, or 5.4% of the population, identify as Asian. The share of Asian residents in Monmouth County is slightly lower than in New Jersey overall, where 10% of the population is Asian. Monmouth County ranks 11th statewide in terms of Asian residents as a share of the population, out of 21 counties.

Since the 2020 Census, Monmouth County's Asian population has declined by an estimated 3.8%. Asian residents' share of Monmouth County's population has remained roughly unchanged at 5.4%.

Monmouth County is more Asian than neighboring Ocean County (1.9% Asian). Monmouth County is less Asian than neighboring Richmond County (12.7% Asian), Middlesex County (25.4% Asian), Union County (5.6% Asian), and Kings County (12.1% Asian).

Monmouth County's Hispanic Population

83,325 residents of Monmouth County, or 12.9% of the population, identify as Hispanic. The share of Hispanic residents in Monmouth County is lower than in New Jersey overall, where 22.5% of the population is Hispanic. Monmouth County ranks 13th statewide in terms of Hispanic residents as a share of the population, out of 21 counties.

Since the 2020 Census, Monmouth County's Hispanic population has grown by an estimated 3.2%. Hispanic residents' share of Monmouth County's population has remained roughly unchanged at 12.9%.

Monmouth County is more Hispanic than neighboring Ocean County (10.9% Hispanic). Monmouth County is less Hispanic than neighboring Richmond County (19.6% Hispanic), Middlesex County (23.6% Hispanic), Union County (35.2% Hispanic), and Kings County (19% Hispanic).

Monmouth County's Native American/Other Population

5,578 residents of Monmouth County, 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 County is comparable to the share in New Jersey overall, where 0.9% of the population is Native American/Other. Monmouth County ranks 8th statewide in terms of Native American/Other residents as a share of the population, out of 21 counties.

Since the 2020 Census, Monmouth County's Native American/Other population has grown by an estimated 8.4%. Native American/Other residents' share of Monmouth County's population has remained roughly unchanged at 0.9%.

Monmouth County is more Native American/Other than neighboring Richmond County (0.7% Native American/Other), and Ocean County (0.5% Native American/Other). Monmouth County is less Native American/Other than neighboring Union County (1.3% Native American/Other), and Kings County (1.3% Native American/Other).

Monmouth County's Multiracial Population

23,235 residents of Monmouth County, or 3.6% of the population, identify as Multiracial. The share of Multiracial residents in Monmouth County is comparable to the share in New Jersey overall, where 3.5% of the population is Multiracial. Monmouth County ranks 10th statewide in terms of Multiracial residents as a share of the population, out of 21 counties.

Since the 2020 Census, Monmouth County's Multiracial population has grown by an estimated 6.9%. Multiracial residents' share of Monmouth County's population has remained roughly unchanged at 3.6%.

Monmouth County is more Multiracial than neighboring Richmond County (2.7% Multiracial), Middlesex County (2.9% Multiracial), Union County (3.4% Multiracial), and Ocean County (2.7% Multiracial). Monmouth County is less Multiracial than neighboring Kings County (5% 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.