Lewis County, Washington Demographics 2026

Population Overview

Lewis County is located in Washington with a total population of 83,925. It is the 16th most populous county out of 39 in Washington.

Age Demographics

The median age in Lewis County is 42.4 years. This is 11% higher than the state median of 38.2 years.

Economy, Income & Housing

The median household income in Lewis County is $69,690. This is 27% lower than the state median of $94,952. Compared to the national median of $78,538, household income here is 11% lower. The poverty rate stands at 13.0%. This is 31% higher than the state poverty rate of 9.9%. The unemployment rate is 5.9%. This is 19% higher than the state rate of 5.0%. The median home value is $341,500. Housing costs are 34% lower than the state median of $519,800. The home-value-to-income ratio is 4.9x. 74.2% of occupied housing units are owner-occupied. This homeownership rate is 16% higher than the state average of 63.9%.

Race & Ethnicity

The largest racial or ethnic group in Lewis County is White (non-Hispanic), making up 80.6% of the population. Hispanic or Latino residents account for 11.2%. The Black or African American population (0.6%) is well below the state average of 3.8%. The Asian population (1.1%) is well below the state average of 9.3%.

Education

20.2% of residents aged 25 and older hold a bachelor's degree or higher. This is 48% 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 90.4%.