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Population by county — census data (map)

Population, 2010

 

Population, 2000

Population Change, 2000–2010

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

2017

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.

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