PlainCities

Counties · Washington

Counties of Washington

Washington has 39 counties. King County is the largest with 2,344,939 residents in 2025. 37 of the 39 gained residents between 2020 and 2025 by the Census Bureau's estimates.

What counties are in Washington?

Sorted by the 2025 population estimate; sort by any column.

Counties of Washington: 2025 estimate, change since 2020, ACS 2020-2024 5-year estimates
King County2,344,939+3.3%63495$124,746$859,900
Pierce County946,288+2.7%75193$99,564$526,600
Snohomish County870,656+5.2%67175$111,246$696,000
Spokane County558,344+3.5%21130$78,582$410,700
Clark County532,119+5.7%27115$97,536$522,900
Thurston County304,261+3.2%1262$96,563$480,300
Kitsap County283,374+2.8%2860$104,158$555,100
Yakima County259,185+1.0%2857$70,656$310,100
Whatcom County236,392+4.2%1954$81,784$585,800
Benton County221,722+7.2%645$89,874$407,800
Skagit County132,975+2.7%1942$89,263$545,100
Cowlitz County114,885+3.8%1030$76,531$397,500
Grant County105,727+6.6%2623$73,267$299,500
Franklin County102,612+6.1%622$86,714$379,300
Lewis County88,062+7.2%1321$74,796$385,800
Island County85,657−1.4%724$90,551$593,300
Chelan County81,941+3.5%923$82,381$490,100
Clallam County78,202+1.4%1225$70,370$421,800
Grays Harbor County78,144+3.3%3221$64,414$314,000
Mason County71,165+8.3%719$83,270$411,800
Walla Walla County62,361−0.4%1014$74,202$408,900
Stevens County49,668+6.9%1115$69,327$350,600
Kittitas County48,803+4.9%1014$73,804$497,400
Whitman County48,512+1.1%1712$55,406$359,600
Douglas County46,473+8.2%69$80,363$432,500
Okanogan County45,230+7.4%1913$63,207$299,800
Jefferson County33,970+3.0%711$74,048$535,000
Pacific County24,357+4.2%1112$67,081$334,800
Klickitat County24,331+7.0%136$71,042$425,300
Asotin County22,545+1.1%56$72,283$325,600
Adams County21,488+4.3%57$66,136$273,300
San Juan County18,577+4.4%29$84,800$799,200
Pend Oreille County14,457+7.9%55$67,436$367,900
Skamania County12,669+5.3%35$93,265$529,500
Lincoln County11,982+10.1%84$71,512$292,800
Ferry County7,517+4.7%153$55,614$283,400
Wahkiakum County4,873+10.2%101$62,653$396,800
Columbia County4,141+4.7%21$71,810$271,200
Garfield County2,416+5.7%21$64,884$239,200

Source: PEP Vintage 2025 (CO-EST2025); American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Census population estimates

How these figures are made: methodology and release checks · reading a margin of error · every state · corrections