Seattle (pronounced /siːˈætɫ̩/ ( listen) see-AT-əl or /siːˈæɾɫ̩/) is the county seat of King County, in the U.S. state of Washington. With 608,660 residents as of the 2010 Census, Seattle is the largest city in the Northwestern United States. The Seattle metropolitan area of about 3.4 million inhabitants is the 15th largest metropolitan area in the country. The city is a major coastal seaport situated on a narrow isthmus between Puget Sound (an arm of the Pacific Ocean) and Lake Washington, about 114 miles (183 km) south of the Canada–United States border. In 2010, Seattle was the sixth busiest port in the United States, serving as a major gateway for trade with Asia.

The Seattle area had been inhabited by Native Americans for at least 4,000 years before the first permanent white settlers.Arthur A. Denny and his group of travelers, subsequently known as the Denny Party, arrived at Alki Point on November 13, 1851. The settlement was moved to its current site and renamed "Seattle" in 1853, after Chief Seattle of the local Duwamish and Suquamish tribes.