Other pages about the topic: Forecasting & Research

County Medicare trends and variations in Washington

Presented below is a series of graphs displaying trends for 2007-18 in each county in Washington and the state in measures associated with Medicare fee-for-service beneficiaries. The graphs are divided into 3 sections:

Educational attainment (mapped by county)

Percent high school graduates

Population Age 25 and Above, 2019

Whitman (95.5%), San Juan (95.9%) and Island (95.3%) County had the highest percentages of high school graduates.

Adams (66.9%), Yakima (73.7%) and Franklin (75.0%) County had the lowest percentages of high school graduates.

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Languages spoken at home (mapped by county)

Percent in households where English is spoken less than "very well"

Population Age 5 and Above, 2019

The smallest share of population where English was spoken less than "Very Well" was in Pend Oreille County at 0.5%. The highest share was in Adams County where 29.0% of persons were in this category.

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Health care data resources

Data available for understanding key access, cost, and quality components of health care in Washington State. Some data sources allow comparison to other states. Primary data sources currently include local and national surveys and data gathering on population characteristics, employers, health services, health expenditures, and health status.


Population by age, mapped by county

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.

Hispanic population as a percent of total population


In 2020, the highest percentages of Hispanic residents were found in central Washington with Adams (69.2%), Franklin (55.9%), and Yakima (51.9%) counties posting the highest shares.

Components of population change


2010 Population  6,724,540
Plus Births     956,500
Less Deaths    -600,557
Plus Net Migration     686,492