List of Washington Counties by Human Development Index

The list below shows the counties of Washington State by Human Development Index 2024 .San Juan and King counties top the list in Washington with (HDI) values exceeding 0.990. Close behind are Jefferson, Island, and Thurston counties, all registering HDIs above 0.960. At the lower end, Adams, Yakima, and Ferry exhibit the state’s lowest levels of human development, with HDI scores below 0.910. The overall HDI for the state stands at 0.945^{[1][2][3] [4]}