Snohomish County, Washington

Snohomish County
County
Aerial view of the Snohomish River delta, including portions of Everett, Lake Stevens, and Marysville
Flag Seal
Location within the U.S. state of Washington
Washington's location within the U.S.
Coordinates: 48°02′N 121°43′W / 48.04°N 121.71°W / 48.04; -121.71
Country	United States
State	Washington
Founded	January 14, 1861
Named for	the Snohomish people
Seat	Everett
Largest city	Everett
Government
• County Executive	Dave Somers
Area
• Total	2,196 sq mi (5,690 km2)
• Land	2,087 sq mi (5,410 km2)
• Water	109 sq mi (280 km2)  5.0%
Population  (2020)
• Total	827,957
• Estimate  (2023)	844,761
• Density	384/sq mi (148/km2)
Time zone	UTC−8 (Pacific)
• Summer (DST)	UTC−7 (PDT)
Area code	206, 360, 425, 564
Congressional districts	1st, 2nd, 8th
Website	snohomishcountywa.gov

Snohomish County (/snoʊˈhoʊmɪʃ/) is a county located in the U.S. state of Washington. With a population of 827,957 as of the 2020 census,^[1] it is the third-most populous county in Washington, after nearby King and Pierce counties, and the 72nd-most populous in the United States. The county seat and largest city is Everett. The county forms part of the Seattle metropolitan area, which also includes King and Pierce counties to the south.

The county's western portion, facing Puget Sound and other inland waters of the Salish Sea, is home to the majority of its population and major cities. The eastern portion is rugged and includes portions of the Cascade Range, with few settlements along major rivers and most of it designated as part of Mount Baker–Snoqualmie National Forest. Snohomish County is bound to the north by Skagit County, to the east by Chelan County, to the south by King County, and to the west by Kitsap and Island counties.

Snohomish County was created out of Island County on January 14, 1861, and is named for the indigenous Snohomish people.^[2] It includes the Tulalip Indian Reservation, which was established by the 1855 Point Elliott Treaty, which relocated several indigenous Coast Salish groups to the reservation. The county seat was originally at the city of Snohomish until an 1897 election moved it to Everett. Since the mid-20th century, areas of Snohomish County have developed into an aerospace manufacturing center, largely due to the presence of Boeing in Everett, as well as bedroom communities for workers in Seattle.

Snohomish County now has 18 incorporated cities and 2 towns with their own local governments, in addition to developed unincorporated areas. It is connected to nearby areas by roads (including Interstate 5), railways, and transit systems. The county government is led by a five-member county council and chief executive elected by voters to four-year terms.