Washington County, Oregon Demographics 2026

Population Overview

Washington County is located in Oregon with a total population of 600,266. It is the 2nd most populous county out of 36 in Oregon.

Age Demographics

The median age in Washington County is 37.8 years. This is 6% lower than the state median of 40.1 years.

Economy, Income & Housing

The median household income in Washington County is $104,434. This is 30% higher than the state median of $80,426. Compared to the national median of $78,538, household income here is 33% higher. The poverty rate stands at 8.0%. This is 33% lower than the state poverty rate of 11.9%. The unemployment rate is 4.5%. This is 15% lower than the state rate of 5.4%. The median home value is $558,500. Housing costs are 23% higher than the state median of $454,200. The home-value-to-income ratio is 5.3x. 60.9% of occupied housing units are owner-occupied. This homeownership rate is 4% lower than the state average of 63.4%.

Race & Ethnicity

The largest racial or ethnic group in Washington County is White (non-Hispanic), making up 61.3% of the population. Hispanic or Latino residents account for 18.2%. The Asian population is significantly higher than the state average (11.1% vs 4.4%).

Education

46.7% of residents aged 25 and older hold a bachelor's degree or higher. This places Washington County in the top 10% of all cities in the state for educational attainment. This is 29% higher than the state rate of 36.2%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 92.9%. Notably, 18.2% of adults hold a graduate or professional degree, indicating a highly educated workforce.