Seattle metropolitan area
metropolitan area in Washington State, United States
The Seattle metropolitan area is an urban conglomeration in the U.S. state of Washington that comprises Seattle, its surrounding satellites, and suburbs. The United States Census Bureau defines the Seattle–Tacoma–Bellevue, WA metropolitan statistical area as the three most populous counties in the state: King, Pierce, and Snohomish. Seattle has the 15th largest metropolitan statistical area (MSA) in the United States with a population of 4,018,762 as of the 2020 census, over half of Washington's total population.
The area is considered part of the greater Puget Sound region, which largely overlaps with the Seattle Combined Statistical Area (CSA). The Seattle metropolitan area is home to a large tech industry and is the headquarters of several major companies, including Microsoft and Amazon. The area's geography is varied and includes the lowlands around Puget Sound and the Cascade Mountains; the highest peak in the metropolitan area is Mount Rainier, which has a summit elevation of 14,411 feet (4,392 m) and is one of the tallest mountains in the United States.
Definitions
As defined by the U.S. Census Bureau and the Office of Management and Budget, the Seattle metropolitan area is officially the Seattle–Tacoma–Bellevue, WA metropolitan statistical area (MSA) and consists of:
Everett metropolitan division
Snohomish County: north of Seattle
Seattle–Bellevue–Kent metropolitan division
King County: Seattle and its immediate vicinity
Tacoma–Lakewood metropolitan division
Pierce County: south of Seattle
Based on commuting patterns, the adjacent metropolitan areas of Olympia, Bremerton, and Mount Vernon, along with a few smaller satellite urban areas, are grouped together in a wider labor market region known as the Seattle–Tacoma combined statistical area (CSA), which encompasses most of the Puget Sound region. The population of this wider region was 4,953,389 at the 2020 census and estimated to be 5,105,721 in 2024; the Puget Sound region is home to two-thirds of Washington's population. The Seattle CSA is the 14th largest in the United States and the 13th largest primary census statistical area in the country. The additional metropolitan and micropolitan areas included are:
Bremerton–Silverdale–Port Orchard metropolitan area
Kitsap County: west of Seattle, separated from the city by Puget Sound
Centralia micropolitan area
Lewis County: south of Olympia
Mount Vernon–Anacortes metropolitan area
Skagit County: north of Everett
Oak Harbor micropolitan area
Island County: northwest of Everett, encompassing Whidbey Island and Camano Island in Puget Sound
Olympia–Lacey–Tumwater metropolitan area
Thurston County: southwest of Seattle, at the south end of Puget Sound
Shelton micropolitan area
Mason County: west of Tacoma and northwest of Olympia
Establishment and expansion
The Census Bureau adopted metropolitan districts in the 1910 census to create a standard definition for urban areas with industrial activity around a central city.
This brief starts where responsible research should: with the source description of “Seattle metropolitan area” as metropolitan area in Washington State, United States. Everything that follows is an evidence route, not borrowed authority.
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The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Sep 16, 2026. The linked authority identifier is Q1114947. VIAF identifies the subject as 315159929. Authority coordinates are 47.490, -121.830. None of the 2 selected statements returned an explicit reference. The first chronological checks are 2020, 2024 and 1910.
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This entry incorporates text from “Seattle metropolitan area” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.