As defined by the United States Census Bureau, the Seattle metropolitan area is made up of the following counties (see Fig. STB):

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–Olympia Combined Statistical Area (CSA) (See Figure STO'). The population of this wider region is 4,087,033. The Seattle CSA is the 13th largest CSA in the country. The additional metropolitan and micropolitan areas included are:

Major:

Other:

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Cascade Range | Central Washington | Columbia Gorge | Columbia Plateau | Columbia River | Eastern Washington | Inland Empire | Kitsap Peninsula | Long Beach Peninsula | Okanogan Country | Olympic Peninsula | Palouse | Puget Sound | San Juan Islands | Skagit Valley | Western Washington | Yakima Valley

Seattle | Seattle metropolitan area | Spokane | Tacoma | Tri-Cities | Vancouver | Bellevue | Everett |

Aberdeen | Anacortes | Arlington | Auburn | Bainbridge Island | Battle Ground | Bellingham | Bonney Lake | Bothell | Bremerton | Burien | Camas | Centralia | Cheney | Cle Elum | Coupville | Covington | Des Moines | East Wenatchee | Edmonds | Ellensburg | Enumclaw | Federal Way | Fort Lewis | Grandview | Issaquah | Kelso | Kenmore | Kennewick | Kent | Kirkland | Lacey | Lake Forest Park | Lake Stevens | Lakewood | Langley | Longview | Lynden | Lynnwood | Mabton | Maple Valley | Marysville | Mercer Island | Mill Creek | Monroe | Moses Lake | Mountlake Terrace | Mount Vernon | Mukilteo | Naches | Oak Harbor | Olympia | Pasco | Port Angeles | Port Orchard | Prosser | Pullman | Puyallup | Redmond | Renton | Richland | Sammamish | SeaTac | Sedro-Woolley | Selah | Shelton | Shoreline | Silverdale | Spokane Valley | Sunnyside | Toppenish | Tukwila | Tumwater | University Place | Walla Walla | Wapato | Washougal | Wenatchee | West Richland | Woodinville | Yakima| Zillah

Adams | Asotin | Benton | Chelan | Clallam | Clark | Columbia | Cowlitz | Douglas | Ferry | Franklin | Garfield | Grant | Grays Harbor | Island | Jefferson | King | Kitsap | Kittitas | Klickitat | Lewis | Lincoln | Mason | Okanogan | Pacific | Pend Oreille | Pierce | San Juan | Skagit | Skamania | Snohomish | Spokane | Stevens | Thurston | Wahkiakum | Walla Walla | Whatcom | Whitman | Yakima