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.
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
Among US counties, Plymouth County stands out first on household income: a median of $109,698, above the US median of $78,538. Plymouth County is a county in Massachusetts with a population of 531,889. It is the #7-largest of all counties in Massachusetts nationally.
Earnings sit at the high end: a median household income of $109,698, above the US median of $78,538. Very few residents live in poverty — 4.6%, below the national 12.4%. Housing is expensive: the median home is worth $513,000, with typical rent around $1,655.
Plymouth County is among the best-educated US counties: 41.2% of adults 25 and older hold a bachelor’s degree, above the national 35.0%. Working from home is common here: 14.7% of workers do so, close to the national 14.0%, and the average commute runs about 33 minutes each way.
Taken together, the income and housing figures place Plymouth County firmly in the higher-cost, higher-earning tier of US counties — a profile that tends to track dense job markets and competitive housing.
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 |
|---|---|
| 2010 | 495,937 |
| 2011 | 498,212 |
| 2012 | 499,545 |
| 2013 | 502,895 |
| 2014 | 506,634 |
| 2015 | 509,413 |
| 2016 | 512,535 |
| 2017 | 515,984 |
| 2018 | 518,888 |
| 2019 | 521,841 |
| 2020 | 528,454 |
| 2021 | 532,726 |
| 2022 | 534,297 |
| 2023 | 537,807 |
| 2024 | 542,090 |
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
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
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
Other counties in Massachusetts
Part of Massachusetts
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County rankings
Common questions about Plymouth County, MA
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.
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.