Plymouth County, Massachusetts Demographics 2026

Population Overview

Plymouth County is located in Massachusetts with a total population of 531,889. It is the 7th most populous county out of 14 in Massachusetts. The county encompasses 2 Census-designated places.

Age Demographics

The median age in Plymouth County is 42.9 years. This is 7% higher than the state median of 40.0 years.

Economy, Income & Housing

The median household income in Plymouth County is $109,698. This is 8% higher than the state median of $101,341. Compared to the national median of $78,538, household income here is 40% higher. The poverty rate stands at 7.1%. This is 29% lower than the state poverty rate of 10.0%. The unemployment rate is 5.1%. The median home value is $513,000. Housing costs are 2% lower than the state median of $525,800. The home-value-to-income ratio is 4.7x. 77.6% of occupied housing units are owner-occupied. This homeownership rate is 24% higher than the state average of 62.6%.

Race & Ethnicity

The largest racial or ethnic group in Plymouth County is White (non-Hispanic), making up 76.8% of the population. Black or African American residents account for 8.4%. The Hispanic or Latino population (4.7%) is well below the state average of 12.9%. The Asian population (1.7%) is well below the state average of 7.0%.

Education

41.2% of residents aged 25 and older hold a bachelor's degree or higher. This is 12% lower than the state rate of 46.6%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 93.2%. Notably, 15.6% of adults hold a graduate or professional degree, indicating a highly educated workforce.