Ranking of Washington Counties By Voting-age Population Percentage from Census 2020

According to the data from the US 2020 Census, as at April 2020, Jefferson County had the highest voting-age population percentage in Washington (87.79%), followed by San Juan County (85.78%), and Whitman County (84.47%).

The chart below shows the top 10 counties with high voting-age population percentage, and the table below shows the ranking of all Washington counties based on the percentage of the population that were in the voting-age (18 years and over) group.

You can also see the ranking of counties by population for other states as well as for the whole United States.