Other pages about the topic: Forecasting & Research

Population by county — census data (map)

Population, 2010


Population, 2000

Population Change, 2000–2010

Population by race

Washington state population by race


Population by age, mapped by county

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.

Hispanic population as a percent of total population


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.

Components of population change


2000 Population 5,894,143
Plus Births + 842,082
Less Deaths - 463,516
Plus Net Migration + 451,831
2010 Population = 6,724,540

The 2002 Washington Input-Output Model

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.