Mercer County Demographics

A map of Mercer County's Population by Race

Mercer County, New Jersey had a population of 387,340 in 2020. It was 43.5% White, 18.7% Black, 12.5% Asian, 21.7% Hispanic, 0.6% Native American/Other, and 3.0% Multiracial. This map presents the population of Mercer County, with one dot drawn for each person counted in the 2020 Census, color-coded by race.

Mercer County is the 12th most populous county of the 21 counties in New Jersey.

Mercer County's White Population

168,580 residents of Mercer County identify as White, or 43.5%. This makes the White share of the population of Mercer County slightly less than the White share of the population of New Jersey (51.9% White). Of the 21 counties in New Jersey, Mercer County is ranked #15 in terms of White residents as a share of the population.

Mercer County is more White than neighboring Middlesex County (38.6% White). Mercer County is less White than neighboring Somerset County (51.4% White), Hunterdon County (81.2% White), Burlington County (63.8% White), and Bucks County (80.7% White).

Mercer County's Black Population

72,364 residents of Mercer County identify as Black, or 18.7%. This makes the Black share of the population of Mercer County slightly larger than the Black share of the population of New Jersey (12.4% Black). Of the 21 counties in New Jersey, Mercer County is ranked #3 in terms of Black residents as a share of the population.

Mercer County is more Black than neighboring Somerset County (8.8% Black), Middlesex County (9.1% Black), Hunterdon County (2.3% Black), Burlington County (16.2% Black), and Bucks County (3.9% Black).

Mercer County's Asian Population

48,330 residents of Mercer County identify as Asian, or 12.5%. This makes the Asian share of the population of Mercer County roughly similar to the Asian share of the population of New Jersey (10.2% Asian). Of the 21 counties in New Jersey, Mercer County is ranked #5 in terms of Asian residents as a share of the population.

Mercer County is more Asian than neighboring Hunterdon County (4.4% Asian), Burlington County (5.6% Asian), and Bucks County (5.4% Asian). Mercer County is less Asian than neighboring Somerset County (19.4% Asian), and Middlesex County (26.4% Asian).

Mercer County's Hispanic Population

84,177 residents of Mercer County identify as Hispanic, or 21.7%. This makes the Hispanic share of the population of Mercer County roughly similar to the Hispanic share of the population of New Jersey (21.6% Hispanic). Of the 21 counties in New Jersey, Mercer County is ranked #7 in terms of Hispanic residents as a share of the population.

Mercer County is more Hispanic than neighboring Somerset County (16.6% Hispanic), Hunterdon County (8.5% Hispanic), Burlington County (8.7% Hispanic), and Bucks County (6.2% Hispanic). Mercer County is less Hispanic than neighboring Middlesex County (22.4% Hispanic).

Mercer County's Native American/Other Population

2,412 residents of Mercer County identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other, or 0.6%. This makes the Native American/Other share of the population of Mercer County roughly similar to the Native American/Other share of the population of New Jersey (0.9% Native American/Other). Of the 21 counties in New Jersey, Mercer County is ranked #15 in terms of Native American/Other residents as a share of the population.

Mercer County is more Native American/Other than neighboring Hunterdon County (0.5% Native American/Other), and Bucks County (0.5% Native American/Other). Mercer County is less Native American/Other than neighboring Somerset County (0.7% Native American/Other), Middlesex County (1% Native American/Other), and Burlington County (0.9% Native American/Other).

Mercer County's Multiracial Population

11,477 residents of Mercer County identify as Multiracial, or 3.0%. This makes the Multiracial share of the population of Mercer County roughly similar to the Multiracial share of the population of New Jersey (3.1% Multiracial). Of the 21 counties in New Jersey, Mercer County is ranked #16 in terms of Multiracial residents as a share of the population.

Mercer County is more Multiracial than neighboring Middlesex County (2.5% Multiracial). Mercer County is less Multiracial than neighboring Somerset County (3.1% Multiracial), Hunterdon County (3.1% Multiracial), Burlington County (4.8% Multiracial), and Bucks County (3.4% Multiracial).

Source: 2020 Census State Redistricting Data and Census TIGER/Line Shapefiles.