Plymouth County, Massachusetts Population 2026

Updated April 2026 · US Census ACS 2023 5-Year Estimates · 7th-largest in Massachusetts

The population of Plymouth County, Massachusetts is 531,889 as of the 2023 American Community Survey, making it the 7th-largest county in Massachusetts. The median household income is $109,698, the median home value is $513,000, and the median age is 42.9.

The population of Plymouth County has grown 9.3% since 2010 (495,937 → 542,090), a +0.64% annualized rate.

Plymouth County within Massachusetts · Source: US Census TIGER/Line via us-atlas

531,889

Population

+0.64%

Annual growth

808

People / sq mi

$109,698

Median Income

$513,000

Median Home Value

Plymouth County covers 659 sq mi of land at 807.7 people per square mile.

About Plymouth County, MA

Plymouth County is a county in Massachusetts with a population of 531,889. It ranks #7 among counties in Massachusetts by population. The median age is 42.9, older than the national median. The population is 48.9% male and 51.1% female.

The median household income in Plymouth County is $109,698, above the US median of $74,580. 4.6% of residents live below the federal poverty level. Home values sit at a median of $513,000, with monthly rent averaging $1,655. The homeownership rate of 77.6% is higher than the national rate of 64.8%.

Educational attainment in Plymouth County reflects 41.2% of adults 25 and older holding a bachelor's degree or higher, above the national average of 34.3%. Roughly 14.7% of workers primarily work from home, similar to the national work-from-home rate of 14.2%. The average commute is 32.9 minutes each way.

Plymouth County Population History (2010-2024)

The county of Plymouth County had a population of 495,937 in 2010 and 542,090 in 2024, a 9.3% growth over 14 years. The peak was 542,090 in 2024. Average annual growth rate: 0.64%.

542,090

Population (2024)

495,937

Population (2010)

542,090

Peak (2024)

0.64%

Avg Annual Growth

Year	Population	Change	Annual %	Source
2010	495,937	-	-	estimate
2011	498,212	+2,275	+0.46%	estimate
2012	499,545	+1,333	+0.27%	estimate
2013	502,895	+3,350	+0.67%	estimate
2014	506,634	+3,739	+0.74%	estimate
2015	509,413	+2,779	+0.55%	estimate
2016	512,535	+3,122	+0.61%	estimate
2017	515,984	+3,449	+0.67%	estimate
2018	518,888	+2,904	+0.56%	estimate
2019	521,841	+2,953	+0.57%	estimate
2020	528,454	+6,613	+1.27%	estimate
2021	532,726	+4,272	+0.81%	estimate
2022	534,297	+1,571	+0.29%	estimate
2023	537,807	+3,510	+0.66%	estimate
2024	542,090	+4,283	+0.80%	estimate

Race & Ethnicity

White	78.0%
Black or African American	8.8%
Asian	0.0%
Hispanic or Latino (any race)	0.9%
Two or More Races	0.0%

Age & Sex

42.9

Median Age

51.1%

Female

48.9%

Male

19.2%

Age 65+

Age Distribution

Under 5

5.1%

5–9

5.7%

10–14

6.0%

15–19

6.4%

20–24

6.0%

25–34

11.1%

35–44

12.0%

45–54

13.3%

55–59

7.5%

60–64

7.6%

65–74

11.5%

75–84

5.6%

85+

2.1%

Children (under 15): 16.8% · Seniors (65+): 19.2%

Income & Poverty

Median household income	$109,698+$8,357 vs state
Mean household income	$147,024
Per-capita income	$55,965
Poverty rate	4.6%-2.0% vs state
Unemployment rate	3.4%
Employment-to-population	63.2%

Top Industries by Employment

Professional & business services

26.1%

Finance & real estate

12.8%

Information

8.4%

Construction

8.3%

Education & health care

7.6%

Manufacturing

6.5%

Public administration

5.0%

Retail trade

4.6%

The largest employment sector in Plymouth County is professional & business services, accounting for 26.1% of workers.

How residents commute

3.3%

Drive alone

1.6%

Carpool

71.8%

Public transit

14.7%

Work from home

32.9 min

Avg commute

Housing

$513,000$-12,800 vs state

Median home value

$1,655

Median rent

77.6%

Homeownership rate

216,654

Total housing units

92.8%

Occupied

7.2%

Vacant

22.4%

Renter-occupied

Social & access

97.5%

With health insurance

95.6%

With broadband internet

14.2%

Foreign-born

6.0%

Veterans (18+)

11.7%

With a disability

85.7%

Speak language other than English at home

Education

93.2%

High School+

41.2%

Bachelor's+

Largest cities in Massachusetts

Boston (663,972)Worcester (205,501)Springfield (154,751)Cambridge (117,794)Lowell (114,799)Brockton (105,080)Quincy (101,361)Lynn (100,905)New Bedford (100,731)Fall River (93,764)All Massachusetts cities →

Other counties in Massachusetts

Middlesex County (1,622,896)Worcester County (861,664)Essex County (807,258)Suffolk County (782,172)Norfolk County (724,540)Bristol County (578,436)Hampden County (462,853)Barnstable County (230,073)Hampshire County (156,595)Berkshire County (128,047)All Massachusetts counties →

Part of Massachusetts

Massachusetts demographic profile All Massachusetts data →

Metro areas in Massachusetts

Boston (4,917,661)Providence (1,673,807)Worcester (861,664)Springfield (462,853)Barnstable Town (230,073)Amherst Town (156,595)Pittsfield (128,047)All US metros →

County rankings

US Counties by Population Richest US Counties by Median Household Income Expensive US Counties by Home Value Educated US Counties Counties With Highest Poverty Rates Youngest US Counties by Median Age Oldest US Counties by Median Age Cheapest US Counties by Median Home Value Racially Diverse US Counties Counties With Largest Hispanic Population All rankings →

Common questions about Plymouth County, MA

What is the population of Plymouth County, MA?What is the median household income in Plymouth County, MA?What is the median home value in Plymouth County, MA?What are the demographics of Plymouth County, MA?What is the cost of living in Plymouth County, MA?Is Plymouth County, MA growing?

Frequently Asked Questions

Plymouth County, Massachusetts has a population of 531,889 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 7th-largest county in Massachusetts. Population density is 808 people per square mile.

The population of Plymouth County has grown 9.3% since 2010 (495,937 → 542,090), a +0.64% annualized rate.

The median household income in Plymouth County, Massachusetts is $109,698, with mean (average) household income of $147,024 and per-capita income of $55,965. 4.6% of residents live below the federal poverty level.

In Plymouth County, the largest racial and ethnic groups are White (78.0%), Black or African American (8.8%), Hispanic or Latino (0.9%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.

The median age in Plymouth County, Massachusetts is 42.9 years. Residents are 51.1% female and 48.9% male.

The median home value in Plymouth County is $513,000 and median monthly rent is $1,655. 77.6% of occupied housing units are owner-occupied. The county has 216,654 total housing units, 7.2% of which are vacant.

The largest employment sector in Plymouth County, Massachusetts is professional, scientific, and management services, employing 26.1% of workers. The unemployment rate is 3.4%.

Boston is among the largest cities associated with Plymouth County, Massachusetts, with a population of 663,972.