Plymouth County Demographics

A map of Plymouth County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	407,191	406,919	76.1%	76.7%
Black	41,606	43,482	7.8%	8.2%
Multiracial	36,123	35,917	6.8%	6.8%
Hispanic	26,184	23,952	4.9%	4.5%
Native American/Other	15,012	12,856	2.8%	2.4%
Asian	8,959	7,693	1.7%	1.4%

Plymouth County, Massachusetts has an estimated population of 535,075, a less than 1% change from the 530,819 recorded in the 2020 Census. The population is 76.1% White, 7.8% Black, 6.8% Multiracial, 4.9% Hispanic, 2.8% Native American/Other, and 1.7% Asian. This demographic dot map shows the population of Plymouth County, with one dot drawn for each person counted by the Census, color-coded by race.

Plymouth has become slightly more racially diverse since the 2020 Census. It is considerably less diverse than Massachusetts overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Plymouth County, that probability was 39.8% in 2020 and 40.7% in the most recent ACS estimates.

Plymouth County is ranked the 7th most populous county in Massachusetts, out of 14 counties. Plymouth County was ranked the 7th most populous county in the 2020 Census.

Plymouth County's White Population

407,191 residents of Plymouth County, or 76.1% of the population, identify as White. The share of White residents in Plymouth County is higher than in Massachusetts overall, where 66.6% of the population is White. Plymouth County ranks 7th statewide in terms of White residents as a share of the population, out of 14 counties.

Since the 2020 Census, Plymouth County's White population has remained roughly the same. White residents' share of Plymouth County's population has decreased from 76.7% to 76.1%.

Plymouth County is more White than neighboring Bristol County (75.3% White), Suffolk County (43.6% White), and Norfolk County (68.7% White). Plymouth County is less White than neighboring Barnstable County (85.2% White), and Dukes County (80% White).

Plymouth County's Black Population

41,606 residents of Plymouth County, or 7.8% of the population, identify as Black. The share of Black residents in Plymouth County is comparable to the share in Massachusetts overall, where 6.4% of the population is Black. Plymouth County ranks 2nd statewide in terms of Black residents as a share of the population, out of 14 counties.

Since the 2020 Census, Plymouth County's Black population has declined by an estimated 4.3%. Black residents' share of Plymouth County's population has remained roughly unchanged at 7.8%.

Plymouth County is more Black than neighboring Bristol County (4% Black), Norfolk County (7.1% Black), Barnstable County (2.8% Black), and Dukes County (2.7% Black). Plymouth County is less Black than neighboring Suffolk County (17.1% Black).

Plymouth County's Asian Population

8,959 residents of Plymouth County, or 1.7% of the population, identify as Asian. The share of Asian residents in Plymouth County is lower than in Massachusetts overall, where 7.3% of the population is Asian. Plymouth County ranks 12th statewide in terms of Asian residents as a share of the population, out of 14 counties.

Since the 2020 Census, Plymouth County's Asian population has grown by an estimated 16.5%. Asian residents' share of Plymouth County's population has remained roughly unchanged at 1.7%.

Plymouth County is more Asian than neighboring Barnstable County (1.5% Asian), and Dukes County (1.5% Asian). Plymouth County is less Asian than neighboring Bristol County (2.4% Asian), Suffolk County (9.2% Asian), and Norfolk County (12.4% Asian).

Plymouth County's Hispanic Population

26,184 residents of Plymouth County, or 4.9% of the population, identify as Hispanic. The share of Hispanic residents in Plymouth County is lower than in Massachusetts overall, where 13.3% of the population is Hispanic. Plymouth County ranks 12th statewide in terms of Hispanic residents as a share of the population, out of 14 counties.

Since the 2020 Census, Plymouth County's Hispanic population has grown by an estimated 9.3%. Hispanic residents' share of Plymouth County's population has remained roughly unchanged at 4.9%.

Plymouth County is more Hispanic than neighboring Barnstable County (3.7% Hispanic), and Dukes County (3.3% Hispanic). Plymouth County is less Hispanic than neighboring Bristol County (10.2% Hispanic), Suffolk County (23.2% Hispanic), and Norfolk County (5.8% Hispanic).

Plymouth County's Native American/Other Population

15,012 residents of Plymouth County, or 2.8% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Plymouth County is comparable to the share in Massachusetts overall, where 1.3% of the population is Native American/Other. Plymouth County ranks 2nd statewide in terms of Native American/Other residents as a share of the population, out of 14 counties.

Since the 2020 Census, Plymouth County's Native American/Other population has grown by an estimated 16.8%. Native American/Other residents' share of Plymouth County's population has remained roughly unchanged at 2.8%.

Plymouth County is more Native American/Other than neighboring Bristol County (1.8% Native American/Other), Suffolk County (1.2% Native American/Other), Norfolk County (1.2% Native American/Other), and Barnstable County (1.7% Native American/Other). Plymouth County is less Native American/Other than neighboring Dukes County (3.9% Native American/Other).

Plymouth County's Multiracial Population

36,123 residents of Plymouth County, or 6.8% of the population, identify as Multiracial. The share of Multiracial residents in Plymouth County is comparable to the share in Massachusetts overall, where 5.1% of the population is Multiracial. Plymouth County ranks 2nd statewide in terms of Multiracial residents as a share of the population, out of 14 counties.

Since the 2020 Census, Plymouth County's Multiracial population has remained roughly the same. Multiracial residents' share of Plymouth County's population has remained roughly unchanged at 6.8%.

Plymouth County is more Multiracial than neighboring Bristol County (6.2% Multiracial), Suffolk County (5.6% Multiracial), Norfolk County (4.8% Multiracial), and Barnstable County (5.2% Multiracial). Plymouth County is less Multiracial than neighboring Dukes County (8.6% 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.