Other pages about the topic: Forecasting & Research
Population Change, 2000–2010
Washington state population by race
Median Age, 2010
In 2010, the median age of persons living in Washington state was 37.3 years. In 2017 the median age had increased to 38.2 years.
Jefferson County had the highest median age in 2010 at 53.9 years. By 2017, the median age in Jefferson County had reached 57.9 years.
In 2017, the highest percentages of Hispanic residents were found in central Washington with Adams (56.8 percent), Franklin (54.9 percent) and Yakima (49.9 percent) counties posting the highest shares.
Washington state population by age group
|Plus Net Migration
Updated April 2011
In 2006, seven state agencies and the legislative staff, under the direction of University of Washington Geography Professor, Dr. William Beyers, and the Office of Financial Management (OFM) Assistant Director of Forecasting Division, Dr. Irv Lefberg, initiated the estimation of a new version of the Washington State Input-Output model. OFM staff Dr. Ta-Win Lin served as the project coordinator.