Mason County, Washington Demographics 2026

Population Overview

Mason County is located in Washington with a total population of 67,982. It is the 20th most populous county out of 39 in Washington. The county encompasses 7 Census-designated places.

Age Demographics

The median age in Mason County is 44.7 years. This is 17% higher than the state median of 38.3 years.

Economy, Income & Housing

The median household income in Mason County is $83,270. This is 15% lower than the state median of $98,141. It is also 3% higher than the national median of $80,734. The poverty rate stands at 12.3%. This is 24% higher than the state poverty rate of 9.9%. The unemployment rate is 6.6%. This is 29% higher than the state rate of 5.1%. The median home value is $411,800. Housing costs are 27% lower than the state median of $564,600. The home-value-to-income ratio is 4.9x. 82.3% of occupied housing units are owner-occupied. This homeownership rate is 29% higher than the state average of 63.8%.

Race & Ethnicity

The largest racial or ethnic group in Mason County is White (non-Hispanic), making up 74.9% of the population. Hispanic or Latino residents account for 12.8%. The Black or African American population (1.0%) is well below the state average of 3.9%. The Asian population (1.0%) is well below the state average of 9.7%.

Education

21.9% of residents aged 25 and older hold a bachelor's degree or higher. This is 45% lower than the state rate of 39.6%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 90.6%.

Data Sources & Methodology

All figures for Mason County come from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates, with comparisons drawn against Washington and national averages from the same dataset. See our methodology page for how each metric is defined, or data.census.gov for official tables with margins of error.