Other pages about the topic: Age data
Median Age, 2020
In 2010, the median age of persons living in Washington state was 37.3 years. In 2020 the median age had increased to 38.5 years.
Jefferson County had the highest median age in 2010 at 53.9 years. By 2020, the median age in Jefferson County had reached 59.5 years.
Washington state population by age group
Preliminary county data
The Census Bureau has not released all of the data that OFM needs to fully update the Small Area Demographic Estimates (SADE) and related products. OFM used the 2020 Census data released so far to provide preliminary county-level data updates.
- Projections, 2010-2040: State | State (ages 15-19 by single year)