You are here

Home » Washington Data & Research » Statewide data » Washington trends » Population changes » Population by age, mapped by county

Population by age, mapped by county

Median Age, 2023

In 2010, the median age of persons living in Washington state was 37.3 years. In 2023 the median age had increased to 38.8 years.

Jefferson County had the highest median age in 2010 at 53.9 years. By 2023, the median age in Jefferson County had reached 64.1 years.

In 2010, Whitman County, home of Washington State University, had the state's lowest median age at 24.4 years. In 2023, Whitman County still had the lowest median age at 25.5 years. Adams County was the only other county in Washington state with a median age less than 30 years in both 2010 (29.0 years and in 2023 (29.8 years).

return to top

Percent of Population Age 65 and Above, 2020

The age 65 and older population generally represents those nearing retirement.

In 2010, 12.3% of Washington state residents were 65 or older. In 2023, 17.5% Washington state residents were 65 and older.

Jefferson County had the highest share of the population age 65 and older in Washington state with 26.3% in 2010 and 43.5% in 2023.

Franklin County had the lowest share of population 65 and older with 7.3% in 2010 and 10.9% in 2023. Adams County has the second lowest percentages of population 65 and older, with 12.1% in 2023.

return to top

Percent of Population Age 85 and Above, 2020

In 2010, 2022 and 2023, 1.7% of Washington state residents were age 85 or older.

Garfield County had the highest share of 85+ population in 2010 with 4.2%. In 2023, Jefferson had the highest shar of 85+ population with 3.7%

Franklin County had the lowest share of population 85+ in 2010 and in 2023 with 0.9%.

return to top

Data source:

E-mail: OFM.Forecasting@ofm.wa.gov

Last updated
Friday, January 3, 2025
CAPTCHA
This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.