|Counties of Washington|
|Location||State of Washington|
|Populations||2,363 (Garfield) – 2,266,789 (King)|
|Areas||175 square miles (450 km2) (San Juan) – 5,268 square miles (13,640 km2) (Okanogan)|
The U.S. state of Washington has 39 counties. The Provisional Government of Oregon established Vancouver and Lewis Counties in 1845 in unorganized Oregon Country, extending from the Columbia River north to 54°40′ north latitude. After the region was organized within the Oregon Territory with the current northern border of 49° north, Vancouver County was renamed Clark, and six more counties were created out of Lewis County before the organization of Washington Territory in 1853; 28 were formed during Washington's territorial period, two of which only existed briefly. The final five were established in the 22 years after Washington was admitted to the Union as the 42nd state in 1889.
Article XI of the Washington State Constitution addresses the organization of counties. New counties must have a population of at least 2,000 and no county can be reduced to a population below 4,000 due to partitioning to create a new county. To alter the area of a county, the state constitution requires a petition of the "majority of the voters" in that area. A number of county partition proposals in the 1990s interpreted this as a majority of people who voted, until a 1998 ruling by the Washington Supreme Court clarified that they would need a majority of registered voters. No changes to counties have been made since the formation of Pend Oreille County in 1911, except when the small area of Cliffdell was moved from Kittitas to Yakima County in 1970.
King County, home to the state's largest city, Seattle, holds almost 30 percent of Washington's population (2,266,789 residents of 7,785,786 in 2022), and has the highest population density, with more than 1,000 people per square mile (400/km2). Garfield County is both the least populated (2,363) and least densely populated (3.3/sq mi [1.3/km2]). Two counties, San Juan and Island, are composed only of islands. The average county is 1,830 square miles (4,700 km2), with 199,636 people.
Seventeen counties have Native American–derived names, including nine names of tribes whose land settlers would occupy. Another seventeen were named for political figures, only five of whom had lived in the region. The last five are named for geographic places.
The Federal Information Processing Standard (FIPS) code, used by the United States government to uniquely identify counties, is provided with each entry. The FIPS code links in the table point to U.S. Census data pages for each county. Washington's FIPS state code is 53.
See also: Government of Washington (state)
Counties provide a broad scope of services, including court operation, parks and recreation, libraries, arts, social services, elections, waste collection, roads and transportation, zoning and permitting, as well as taxation. The extent of these vary, and some are administered by municipalities. Counties are not subdivided into minor civil divisions like townships; sub-county local government is only by incorporated cities and towns, as well as by 29 Indian reservations, while unincorporated areas are governed only by the county. There are 242 census county divisions for statistical purposes only.
The default form of county government is the non-charter commission, with three to five elected commissioners serving as both the legislature and executive. Seven counties have adopted charters providing for home rule distinct from state law: King, Clallam, Whatcom, Snohomish, Pierce, San Juan, and Clark. Of these, King, Whatcom, Snohomish, and Pierce, four major counties on Puget Sound, elect a county executive. Councils in the other three charter counties appoint a manager to administer the government. Voters may also elect a clerk, treasurer, sheriff, assessor, coroner, auditor (or recorder), and prosecuting attorney. Elections are nonpartisan in non-charter counties, but charter counties may choose to make some positions partisan, though all elections are by top-two primary.
||FIPS code||County seat||Est.||Formed from||Etymology||Population (2022)||Land area||Map|
|Adams County||001||Ritzville||1883||Whitman County||John Adams (1735–1826), 2nd U.S. President||20,961||1,925 sq mi
|Asotin County||003||Asotin||1883||Garfield County||The Nez Percé name for Eel Creek||22,508||636 sq mi
|Benton County||005||Prosser||1905||Yakima and Klickitat Counties||Thomas Hart Benton (1782–1858), a U.S. Senator from Missouri||212,791||1,700 sq mi
|Chelan County||007||Wenatchee||1899||Okanogan and Kittitas Counties||A Native American word meaning "deep water", referring to Lake Chelan||79,926||2,920 sq mi
|Clallam County||009||Port Angeles||1854||Jefferson County||A Klallam word meaning "brave people" or "the strong people"||77,805||1,738 sq mi
|Clark County||011||Vancouver||1845||Original County||William Clark (1770–1838), the co-captain of the Lewis and Clark Expedition||516,779||629 sq mi
|Columbia County||013||Dayton||1875||Walla Walla County||The Columbia River||4,026||869 sq mi
|Cowlitz County||015||Kelso||1854||Lewis County||Cowlitz, an Indian tribe||111,956||1,139 sq mi
|Douglas County||017||Waterville||1883||Lincoln County||Stephen A. Douglas (1813–1861), U.S. Senator from Illinois||44,192||1,819 sq mi
|Ferry County||019||Republic||1899||Stevens County||Elisha P. Ferry (1825–1895), 1st Governor of Washington||7,448||2,204 sq mi
|Franklin County||021||Pasco||1883||Whitman County||Benjamin Franklin (1706–1790), writer, orator, inventor, and U.S. Founding Father||98,678||1,242 sq mi
|Garfield County||023||Pomeroy||1881||Columbia County||James A. Garfield (1831–1881), 20th U.S. President||2,363||710 sq mi
|Grant County||025||Ephrata||1909||Douglas County||Ulysses S. Grant (1822–1885), 18th U.S. President||101,311||2,680 sq mi
|Grays Harbor County||027||Montesano||1854||Thurston County||Grays Harbor, a body of water named after explorer and merchant Robert Gray (1755–1806)||77,038||1,902 sq mi
|Island County||029||Coupeville||1852||Thurston County||Consists solely of islands, including Whidbey and Camano islands||86,625||209 sq mi
|Jefferson County||031||Port Townsend||1852||Thurston County||Thomas Jefferson (1743–1826), 3rd U.S. President and principal author of the Declaration of Independence||33,589||1,804 sq mi
|King County||033||Seattle||1852||Thurston County||William R. King (1786–1853), U.S. Vice President under Franklin Pierce; officially renamed in 2005 after civil rights leader Martin Luther King Jr. (no relation) (1929–1968)||2,266,789||2,115 sq mi
|Kitsap County||035||Port Orchard||1857||King and Jefferson Counties||Chief Kitsap (d. 1860), leader of the Suquamish tribe||277,673||395 sq mi
|Kittitas County||037||Ellensburg||1883||Yakima County||Yakama word of uncertain meaning, with popular translations ranging from "white chalk" to "land of the plenty"||45,189||2,297 sq mi
|Klickitat County||039||Goldendale||1859||Walla Walla County||Klickitat tribe, also meaning "robber" and "beyond"||23,271||1,872 sq mi
|Lewis County||041||Chehalis||1845||Clark County||Meriwether Lewis (1774–1809), the co-captain of the Lewis and Clark Expedition||85,370||2,403 sq mi
|Lincoln County||043||Davenport||1883||Whitman County||Abraham Lincoln (1809–1865), 16th U.S. President||11,601||2,311 sq mi
|Mason County||045||Shelton||1854||King County||Charles H. Mason (1830–1859), 1st Secretary of Washington Territory||68,166||959 sq mi
|Okanogan County||047||Okanogan||1888||Stevens County||A Salish word meaning "rendezvous"||43,127||5,268 sq mi
|Pacific County||049||South Bend||1851||Lewis County||The Pacific Ocean||24,113||933 sq mi
|Pend Oreille County||051||Newport||1911||Stevens County||The Pend d'Oreille tribe, named by French traders for their "ear bobs"||14,179||1,400 sq mi
|Pierce County||053||Tacoma||1852||Thurston County||Franklin Pierce (1804–1869), 14th U.S. President||927,380||1,670 sq mi
|San Juan County||055||Friday Harbor||1873||Whatcom County||San Juan Islands, itself derived from Juan Vicente de Güemes||18,662||174 sq mi
|Skagit County||057||Mount Vernon||1883||Whatcom County||The Skagit tribe||131,179||1,731 sq mi
|Skamania County||059||Stevenson||1854||Clark County||A Chinookan word meaning "swift water"||12,460||1,656 sq mi
|Snohomish County||061||Everett||1861||Island and King Counties||The Snohomish tribe, word origin disputed||840,079||2,087 sq mi
|Spokane County||063||Spokane||1879||Stevens County||The Spokane tribe||549,690||1,764 sq mi
|Stevens County||065||Colville||1863||Walla Walla County||Isaac Stevens (1818–1862), 1st Governor of the Washington Territory||48,229||2,478 sq mi
|Thurston County||067||Olympia||1852||Lewis County||Samuel Thurston (1815–1851), the Oregon Territory's first delegate to U.S. Congress||298,758||722 sq mi
|Wahkiakum County||069||Cathlamet||1854||Cowlitz County||Wakaiakam, chief of the Kathlamet tribe||4,688||264 sq mi
|Walla Walla County||071||Walla Walla||1854||Skamania County||The Walla Walla tribe, also a Nez Percé name for running water||61,890||1,270 sq mi
|Whatcom County||073||Bellingham||1854||Island County||Whatcom, chief of the Nooksack tribe and named for a Nooksack word meaning "noisy water"||230,677||2,107 sq mi
|Whitman County||075||Colfax||1871||Stevens County||Marcus Whitman (1802–1847), a Methodist missionary||47,619||2,159 sq mi
|Yakima County||077||Yakima||1865||Ferguson County (defunct)||The Yakama tribe, meaning "runaway [waters]" or "big belly"||257,001||4,296 sq mi
|Washington (state)||53||Olympia (state capital)||1853||Oregon Territory||George Washington (1732–1799), 1st U.S. President||7,785,786||66,544 sq mi (172,350 km2)|
Four counties changed their name between 1849 and 1925.
During Washington's territorial period, Washington split off from an Oregon county, three counties were disestablished, and three split into separate territories.
Several counties were proposed prior to or during the existence of Washington Territory and nine counties were proposed within the first 16 years of Washington's statehood, but none were established.