Seattle is a seaport city on the West Coast of the United States. It is the seat of King County, Washington. Seattle is the largest city in both the state of Washington and the Pacific Northwest region of North America. According to U.S. Census data released in 2019, the Seattle metropolitan area’s population stands at 3.98 million, and ranks as the 15th-largest in the United States.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.