Plymouth County, Massachusetts
Located in Massachusetts, Plymouth County has a population of 535,075 residents and a median age of 43.0 years, making it the #135 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 7.1%. The median home value is $556,000, and the median household income is $114,201, which is 52% above the national median.
Demographics
Plymouth County has a population of 535,075, making it the #135 most populous county in the US. The median age is 43.0 years, which is 10.5% above the national median.
Population Trend
Rankings →Year-over-Year Population Growth
Age & Sex Distribution
Race & Ethnicity
Nativity
Geographic Mobility (Past Year)
Economy
The median household income in Plymouth County is $114,201, ranking #73 out of 3,222 counties — 52.0% above the national median. The poverty rate is 7.1% and unemployment stands at 5.1%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Plymouth County is $556,000 (+97.2% vs national). Renters pay a median of $1,747/mo and the homeownership rate is 77.6%.
Median Home Value Trend
Rankings →Household Type
Education
In Plymouth County, 41.8% of adults age 25+ hold a bachelor's degree or higher, which is 24.1% above the national average, ranking #230 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Plymouth County is 78.8 years. 13.8% of adults report poor or fair health and 2.4% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
13.1% of adults in Plymouth County smoke , 30.2% are obese , and 23.8% report excessive drinking. The drug overdose death rate is 37.5 per 100,000.
Adult Smoking Trend
Safety
The homicide rate in Plymouth County is 2.1 per 100,000 and the suicide rate is 10.2 per 100,000. Motor vehicle deaths occur at a rate of 8.0 per 100,000.
Homicide Rate Trend
Families & Children
8.5% of children in Plymouth County live in poverty and the infant mortality rate is 3.4 per 1,000 live births. The teen birth rate is 5.3 per 1,000 females age 15–19.
Infant Mortality Trend
Civic & Transportation
Voter turnout in Plymouth County is 77.9%. The mean commute time is 35.8 min, which is 29.7% above the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Plymouth County voted Democratic with a margin of 8.9%. The vote was 53.6% Dem / 44.7% Rep. Compared to 2020, the margin shifted 8.4 toward Republicans .
Vote Share Over Time
About Plymouth County, Massachusetts
Plymouth County, Massachusetts has a total population of 535,075, making it the 135th most populous county in the United States. The median age in Plymouth County is 43.0 years, which is 10.5% above the national median of 38.9 years.
The median household income in Plymouth County is $114,201, which ranks #73 of 3,222 counties nationwide. This is 52.0% above the national median of $75,149. The poverty rate is 7.1%, lower than the national rate of 12.6%. The unemployment rate stands at 5.1%.
The median home value in Plymouth County is $556,000, 97.2% above the national median. Renters in Plymouth County pay a median gross rent of $1,747 per month. The homeownership rate is 77.6%, compared to the national rate of 64.4%.
In Plymouth County, 41.8% of residents aged 25 and older hold a bachelor's degree or higher, 24.1% above the national average of 33.7%. Health insurance coverage stands at 97.5% of the population. The average commute time for workers is 35.8 min.
Plymouth County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 76.1% of the population, followed by Black (non-Hispanic) (7.8%) and Two or More Races (6.8%).
All data for Plymouth County, Massachusetts comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates. These figures are estimates based on survey sampling and are subject to margin of error. For the most detailed and up-to-date data, visit the Census Bureau's official data portal.