Seattle is the most populous city in the U.S. state of Washington and the Pacific Northwest region of North America. It serves as the county seat of King County, which is the most populous county in the state.
As of 2025, Seattle has a population of 784,777, ranking it as the 18th-most populous city in the United States. The surrounding metropolitan area exceeds 4.15 million residents, making it the 15th-most populous metropolitan area in the nation. Between 2010 and 2020, the city experienced a growth rate of 21.1%, establishing it as one of the fastest-growing large cities in the country.