In 2017, the income inequality in Washington was 0.467 according to the GINI calculation of the wage distribution. Income inequality had a 0.104% growth from 2016 to 2017, which means that wage distribution grew somewhat less even. The GINI for Washington was lower than than the national average of 0.479. In other words, wages are distributed more evenly in Washington in comparison to the national average.
This chart shows the number of workers in Washington across various wage buckets compared to the national average.