Seattle is a seaport city on the West Coast of the United States. It is the seat of King County, Washington. With a 2019 population of 753,675, it is the largest city in both the state of Washington and the Pacific Northwest region of North America. The Seattle metropolitan area's population is 3.98 million, making it the 15th-largest in the United States. In 2013-2016, Seattle rated the fastest-growing major city and remained in the top five in May 2015 with an annual growth rate of 2.1%. In July 2016, Seattle ranked as the fastest-growing major U.S. city, with a 3.1% annual growth rate, and continuously among the fastest growing cities in the United States.