Washington State is home to around 8 million people but the latest estimates from the U.S. Census. Their list with new population estimates was updated in April of this year. Other cities, however, I didn't expect to see on the list, like Wapato in the Lower Yakima Valley, or scenic coastal towns like Ilwaco. A Peek at Where Population Losses Could Be the BiggestCensus data shows which of our towns are at risk of losing the most residents in Washington State. Western WashingtonGranite Falls (Snohomish County)Hamilton (Skagit County)Ilwaco (Pacific County)Monroe (Snohomish County)Port Angeles (Clallam County)Woodway (Snohomish County)Granite Falls, WA.