Seattle is in the US.
Seattle ( [ siˈætəl ] ) is a seaport city on the west coast of the United States and the seat of King County , Washington . With an estimated 704,352 residents , Seattle is the largest city in both the state of Washington and the Pacific Northwest region of North America . In July 2013 , it was the fastest-growing major city in the United States and remained in the Top 5 in May 2015 with an annual growth rate of 2.1 % . In July 2016 , Seattle was again the fastest-growing major U.S. city , with a 3.1 % annual growth rate .