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Demographics

According to the 2012–2016 American Community Survey (ACS), the racial makeup of the city was 65.7% White Non-Hispanic, 16.9% Asian, 6.8% Black or African American, 6.6% Hispanic or Latino of any race, 0.4% Native American, 0.9% Pacific Islander, 0.2% other races, and 5.6% two or more races.

Seattle's population historically has been predominantly white. The 2010 census showed that Seattle was one of the whitest big cities in the country, although its proportion of white residents has been gradually declining. In 1960, whites constituted 91.6% of the city's population, while in 2010 they constituted 69.5%. According to the 2006–2008 American Community Survey, approximately 78.9% of residents over the age of five spoke only English at home. Those who spoke Asian languages other than Indo-European languages made up 10.2% of the population, Spanish was spoken by 4.5% of the population, speakers of other Indo-European languages made up 3.9%, and speakers of other languages made up 2.5%.

Seattle's foreign-born population grew 40% between the 1990 and 2000 censuses. The Chinese population in the Seattle area has origins in mainland China, Hong Kong, Southeast Asia, and Taiwan. The earliest Chinese-Americans that came in the late 19th and early 20th centuries were almost entirely from Guangdong Province. The Seattle area is also home to a large Vietnamese population of more than 55,000 residents, as well as over 30,000 Somali immigrants. The Seattle-Tacoma area is also home to one of the largest Cambodian communities in the United States, numbering about 19,000 Cambodian Americans, and one of the largest Samoan communities in the mainland U.S., with over 15,000 people having Samoan ancestry. Additionally, the Seattle area had the highest percentage of self-identified mixed-race people of any large metropolitan area in the United States, according to the 2000 United States Census Bureau. According to a 2012 HistoryLink study, Seattle's 98118 ZIP code (in the Columbia City neighborhood) was one of the most diverse ZIP Code Tabulation Areas in the United States.

According to the ACS 1-year estimates, in 2018, the median income of a city household was $93,481, and the median income for a family was $130,656. 11.0% of the population and 6.6% of families were below the poverty line. Of people living in poverty, 11.4% were under the age of 18 and 10.9% were 65 or older. According to a 2024 study by Henley & Partners, the city of Seattle has an estimated 54,200 millionaires and 11 billionaires.

It is estimated that King County has 8,000 homeless people on any given night, and many of those live in Seattle. In September 2005, King County adopted a "Ten-Year Plan to End Homelessness", one of the near-term results of which is a shift of funding from homeless shelter beds to permanent housing.

In recent years, the city has experienced steady population growth, and has been faced with the issue of accommodating more residents. In 2006, after growing by 4,000 citizens per year for the previous 16 years, regional planners expected the population of Seattle to grow by 200,000 people by 2040. However, former mayor Greg Nickels supported plans that would increase the population by 60%, or 350,000 people, by 2040 and worked on ways to accommodate this growth while keeping Seattle's single-family housing zoning laws. The Seattle City Council later voted to relax height limits on buildings in the greater part of Downtown, partly with the aim to increase residential density in the city center. As a sign of increasing downtown core growth, the Downtown population crested to over 60,000 in 2009, up 77% since 1990.

In 2021 Seattle experienced its first population decline in 50 years.

Seattle has a relatively high number of adults living alone. According to the 2000 U.S. Census interim measurements of 2004, Seattle has the fifth highest proportion of single-person households nationwide among cities of 100,000 or more residents, at 40.8%.