Mason County, Washington Demographics 2026

Population Overview

Mason County is located in Washington with a total population of 66,968. It is the 20th most populous county out of 39 in Washington.

Age Demographics

The median age in Mason County is 44.8 years. This is 17% higher than the state median of 38.2 years.

Economy, Income & Housing

The median household income in Mason County is $78,359. This is 17% lower than the state median of $94,952. Compared to the national median of $78,538, household income here is about average. The poverty rate stands at 12.6%. This is 27% higher than the state poverty rate of 9.9%. The unemployment rate is 6.6%. This is 33% higher than the state rate of 5.0%. The median home value is $377,400. Housing costs are 27% lower than the state median of $519,800. The home-value-to-income ratio is 4.8x. 81.1% of occupied housing units are owner-occupied. This homeownership rate is 27% higher than the state average of 63.9%.

Race & Ethnicity

The largest racial or ethnic group in Mason County is White (non-Hispanic), making up 75.8% of the population. Hispanic or Latino residents account for 12.1%. The Black or African American population (1.0%) is well below the state average of 3.8%. The Asian population (1.0%) is well below the state average of 9.3%.

Education

22.0% of residents aged 25 and older hold a bachelor's degree or higher. This is 43% lower than the state rate of 38.8%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 91.1%.