Ranking of Washington Counties By Population Density from Census 2020

According to the data from the US 2020 Census, as at April 2020, among all Washington counties, King County had the highest population density per square mile (1.07K people per sqr mile), followed by Clark County (800.82 people per sqr mile), and Kitsap County (697.57 people per sqr mile).

On the other hand, Garfield County had the lowest population density (3.22 people per sqr mile), followed by Ferry County (3.26 people per sqr mile), and Columbia County (4.55 people per sqr mile).

The chart below shows the top 10 counties with high population density, and the table below shows the ranking of all Washington counties.

You can also see similar ranking of counties information for other states as well as for all counties in the United States.