The U.S. state of Washington is divided into 39 Counties. Explore the Washington County Map, all Counties list along with their County Seats in alphabetical order and their population, areas and the date of formation.
Washington County Map

About Counties of Washington
U.S State of Washington is located in the western part of the country. Washington is the eighteenth biggest state in its size having the area of 71,362 square miles. The state ranked as the 13 most populous states in the country. The state was admitted to the Union in the year 1889 as the forty-second state of the country. The state shares the borders with Pacific Ocean and Oregon in the south, Idaho in the east, British Columbia which is the Canadian province in north. The capital city of the state is Olympia. Most of the state’s population reside in the state’s largest city called Seattle.
King County among the counties of Washington has the highest number of population in the state with 2,269,675. Pierce County and Snohomish County ranks as the second and third highly populated counties of Washington with 921,130 and 827,957. The least populated county in the state is Garfield County. The oldest county in the state of Washington is Klickitat County which was named after one of the tribes of the land. The biggest county by area is Okanogan County that has arena of 5,267.97 square miles. The other largest counties by area are Yakima and Chelan with 4,295.39 and 2,920.52 square miles each. The tiniest county in the state is San Juan County. The wealthiest county in the state of Washington is King County that has $38,211 per capita income. The second and third position goes to San Juan County with $35,487 and Snohomish County with $30,635.
U.S state of Washington is divided into 39 counties. Counties of Washington further divided into incorporated cities and towns. The local government of Washington consists of 39 counties, 281 cities, towns and villages and 1,285 special districts. Counties of Washington provide a great number of services like court operation, parks and recreation, libraries, arts, elections, waste collection, roads and transportation to the citizens of the state.
The U.S. state of Washington has 39 Counties. This is list of Washington Counties and County Seats in alphabetical order along with check their population, areas and the date of formation.
List of Counties in Washington with County Seats
S.N | County | County Seat | Population | Area | Formed |
---|---|---|---|---|---|
1 | Adams County | Ritzville | 18,728 | 1,925 sq mi | 1883 |
2 | Asotin County | Asotin | 21,623 | 636 sq mi | 1883 |
3 | Benton County | Prosser | 175,177 | 1,703 sq mi | 1905 |
4 | Chelan County | Wenatchee | 72,453 | 2,922 sq mi | 1899 |
5 | Clallam County | Port Angeles | 71,404 | 1,745 sq mi | 1854 |
6 | Clark County | Vancouver | 425,363 | 628 sq mi | 1845 |
7 | Columbia County | Dayton | 4,078 | 869 sq mi | 1875 |
8 | Cowlitz County | Kelso | 102,410 | 1,139 sq mi | 1854 |
9 | Douglas County | Waterville | 38,431 | 1,821 sq mi | 1883 |
10 | Ferry County | Republic | 7,551 | 2,204 sq mi | 1899 |
11 | Franklin County | Pasco | 78,163 | 1,242 sq mi | 1883 |
12 | Garfield County | Pomeroy | 2,266 | 710 sq mi | 1881 |
13 | Grant County | Ephrata | 89,120 | 2,681 sq mi | 1909 |
14 | Grays Harbor County | Montesano | 72,797 | 1,917 sq mi | 1854 |
15 | Island County | Coupeville | 78,506 | 209 sq mi | 1853 |
16 | Jefferson County | Port Townsend | 29,872 | 1,809 sq mi | 1852 |
17 | King County | Seattle | 1,931,249 | 2,126 sq mi | 1852 |
18 | Kitsap County | Port Orchard | 251,133 | 396 sq mi | 1857 |
19 | Kittitas County | Ellensburg | 40,915 | 2,297 sq mi | 1883 |
20 | Klickitat County | Goldendale | 20,318 | 1,872 sq mi | 1859 |
21 | Lewis County | Chehalis | 75,455 | 2,408 sq mi | 1845 |
22 | Lincoln County | Davenport | 10,570 | 2,311 sq mi | 1883 |
23 | Mason County | Shelton | 60,699 | 961 sq mi | 1854 |
24 | Okanogan County | Okanogan | 41,120 | 5,268 sq mi | 1888 |
25 | Pacific County | South Bend | 20,920 | 975 sq mi | 1851 |
26 | Pend Oreille County | Newport | 13,001 | 1,400 sq mi | 1911 |
27 | Pierce County | Tacoma | 795,225 | 1,676 sq mi | 1852 |
28 | San Juan County | Friday Harbor | 15,769 | 175 sq mi | 1873 |
29 | Skagit County | Mount Vernon | 116,901 | 1,735 sq mi | 1883 |
30 | Skamania County | Stevenson | 11,066 | 1,656 sq mi | 1854 |
31 | Snohomish County | Everett | 713,335 | 2,090 sq mi | 1861 |
32 | Spokane County | Spokane | 471,221 | 1,764 sq mi | 1879 |
33 | Stevens County | Colville | 43,531 | 2,478 sq mi | 1863 |
34 | Thurston County | Olympia | 252,264 | 727 sq mi | 1852 |
35 | Wahkiakum County | Cathlamet | 3,978 | 264 sq mi | 1854 |
36 | Walla Walla County | Walla Walla | 58,781 | 1,270 sq mi | 1854 |
37 | Whatcom County | Bellingham | 201,140 | 2,120 sq mi | 1854 |
38 | Whitman County | Colfax | 44,776 | 2,159 sq mi | 1871 |
39 | Yakima County | Yakima | 243,231 | 4,296 sq mi | 1865 |
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Written and Fact-checked by Whereig Web Team | Last Updated: January 13, 2024, 01:05 PM ET