King County begins mailing out property tax bills; some areas to see double-digit increases in rates Sign In FacebookTwitterEmail 1of3 The suburban neighborhood of Queen Anne located just north of downtown Seattle Washington shot from an altitude of about 500 feet during a helicopter photo flight.Art Wager/Getty ImagesShow MoreShow Less 2of3 An aerial view of the lakefront residential community on Mercer Island, Washington State, nestled between the downtown districts of Bellevue and Seattle.Art Wager/Getty ImagesShow MoreShow Less 3of3 The King County Assessor's Office announced that it started sending out 2021 property tax bills on Tuesday — the first issued since the beginning of the COVID-19 pandemic.