Seattle is a seaport city on the United States' West Coast. It is the county seat of Washington's King County. It is the biggest city in both the state of Washington and the Pacific Northwest area of North America, with a population of 753,675 in 2019. The population of the Seattle metropolitan area is 3.98 million, making it the 15th most populous in the United States. Seattle was the fastest-growing large city from 2013 to 2016, and it was still in the top five in May 2015, with an annual growth rate of 2.1 percent. Seattle was the fastest-growing major U.S. city in July 2016, with a 3.1 percent annual growth rate, and has consistently placed among the fastest-growing cities in the country.