Washington County, Iowa Demographics 2026

Population Overview

Washington County is located in Iowa with a total population of 22,539. It is the 27th most populous county out of 99 in Iowa.

Age Demographics

The median age in Washington County is 40.3 years. This is 4% higher than the state median of 38.6 years.

Economy, Income & Housing

The median household income in Washington County is $71,339. This is 2% lower than the state median of $73,147. Compared to the national median of $78,538, household income here is 9% lower. The poverty rate stands at 8.5%. This is 23% lower than the state poverty rate of 11.0%. The unemployment rate is 2.5%. This is 30% lower than the state rate of 3.6%. The median home value is $199,600. Housing costs are 2% higher than the state median of $195,900. With a home-value-to-income ratio of just 2.8x, Washington County is one of the most affordable housing markets in the area. 72.2% of occupied housing units are owner-occupied.

Race & Ethnicity

Washington County has a predominantly White (non-Hispanic) population, comprising 89.2% of all residents. Hispanic or Latino residents account for 7.4%. The Black or African American population (0.6%) is well below the state average of 3.8%. The Asian population (0.5%) is well below the state average of 2.4%.

Education

24.9% of residents aged 25 and older hold a bachelor's degree or higher. This is 19% lower than the state rate of 30.9%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 93.3%.