Seattle is the largest city in the Pacific Northwest region of the United States. It is located in the U.S. state of Washington between Puget Sound and Lake Washington, nearly 108 miles (174 km) south of the United States–Canadian border in King County, of which it is the county seat.

Seattle was founded in the 1850s and named after Chief Seattle, also known as Noah Sealth. As of 2006, the city had an estimated population of 570,430 and a metropolitan population of around 3.1 million. Seattle is the hub for the Greater Puget Sound region. Its official nickname is the Emerald City because of the lush evergreen trees in the surrounding area; it is also referred to as the Rainy City, the Gateway to Alaska, Queen City, and Jet City, due to the local influence of Boeing. Seattle residents are known as Seattleites.

Seattle is known as the birthplace of grunge music, and it has a reputation for heavy coffee consumption: locally founded coffee companies include Starbucks and Tully's Coffee. Seattle was also the site of the 1999 meeting of the World Trade Organization, and the attendant demonstrations by anti-globalization activists, which were in keeping with Seattle's Democratic history and reputation for liberal politics. Researchers at Central Connecticut State University ranked Seattle the most literate city in America in 2005.

Based on per capita income, Seattle ranks 36th of 522 studied areas in the state of Washington.