|WA State Facts|
|Territory: Mar 2, 1853|
|Statehood: Nov 11, 1889|
|Borders: ID, OR and Can|
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Today’s Washington counties did not always exist in the present form. They went through many different changes in the space of a few short years. Washington Counties were first formed while part of the Oregon Territory, and after that the Washington Territory.
Washington Territorial Counties
The first counties were created from unorganized territory in 1845. Eight of the counties were created by Oregon governments prior to the organization of Washington Territory, 26 were created during Washington’s territorial period, and five were created after Washington became a state.
The State of Washington was admitted the union as the 42nd state on November 11, 1889.
Washington Counties Today
Fun Facts about Washington Counties
Counties by Year
- Lewis and Clark Counties was the original 2 counties created on December 21, 1845.
- Pend Oreille County was the last county created on March 01, 1911.
County Size Facts
- Okanogan County (5,268 sq mi) is the largest county in Washington.
- San Juan County (175 sq mi) is the smallest county in Washington.
County Population Facts
- Garfield County (2,225) is the least populated county in Washington.
- King County (2,252,782) is the most populated county in Washington.
Washington City Facts
Washington’s 10 largest cities (2018 est.) are:
- Seattle (744,955) is in King County
- Spokane (219,190) is in Spokane County
- Tacoma (216,279) is in Pierce County
- Vancouver (183,012) is in Clark County
- Bellevue (147,599) is in King County
- Kent (129,618) is in King County
- Everett (111,262) is in Snohomish County
- Renton (102,153) is in King County
- Spokane Valley (99,703) is in Spokane County
- Federal Way (97,044) is in King County
Boundary Changes of Washington Counties from 1843-1915
This Interactive Map of Washington Counties show the historical boundaries, names, organization, and attachments of every county, extinct county and unsuccessful county proposal from 1843 to 1915.
List of Washington Counties
|County||Date Formed||Parent County||County Seat|
|Benton||1905||Yakima and Klickitat Counties||Prosser|
|Chelan||1899||Okanogan and Kittitas Counties||Wenatchee|
|Clallam||1854||Jefferson County||Port Angeles|
|Columbia||1875||Walla Walla County||Dayton|
|Grays Harbor||1915||Thurston County||Montesano|
|Jefferson||1852||Thurston County||Port Townsend|
|Kitsap||1857||King and Jefferson Counties||Port Orchard|
|Klickitat||1859||Walla Walla County||Goldendale|
|Pacific||1851||Lewis County||South Bend|
|Pend Oreille||1911||Stevens County||Newport|
|San Juan||1873||Whatcom County||Friday Harbor|
|Skagit||1883||Whatcom County||Mount Vernon|
|Stevens||1863||Walla Walla County||Colville|
|Walla Walla||1854||Skamania County||Walla Walla|
|Yakima||1865||Ferguson County (defunct)||Yakima|
List of Old Former / Extinct Washington Counties
At least 4 Washington counties that were established no longer exist. A lot of these counties were established and disbanded within the 19th century; county borders have modified very little since 1900 in the vast most of states.
The below counties formerly within the area of the State of Washington no longer exist:
- Chehalis County – Formed in 1854 (renamed Grays Harbor, 1915) Thurston.
- Slaughter County – formed in 1857 and renamed Kitsap County in 1857.
- Sawamish County – formed in 1854 and renamed Mason County in 1864.
- Spokane County (old) – formed in 1859, abolished and became part of Stevens County in 1864; In 1879 part of this county was set off as Present Spokane County
COUNTY County, Washington
Created on DATE from LAND. COUNTY County was renamed to COUNTY County on November 7, 1907.