Some charts showing poverty in WA State (2013) from Census SAIPE or Small Area Income and Poverty Estimates. Of the WA counties with more than ~200K population, Only Spokane and Yakima have a greater poverty rate than Whatcom County.
Top 20 WA Counties ranked by Poverty Count.
Clallam (17.5%), Skagit (16.3%), and Whatcom (16.4%) have the highest poverty rates of all Puget Sound Counties.
Whatcom County poverty rate highlighted from 1997 - 2013. Note the steep climb since 2010.