Clark
Lewis
Pacific
Thurston
Jefferson
King
Pierce
Island
Skamania
Whatcom
Mason (Originally Sawamish County)
Grays Harbor (Originally Chehalis County)
Cowlitz
Wahkiakum
Walla Walla
Clallam
Kitsap (Originally Slaughter County)
Spokane
Klickitat
Snohomish
Stevens
Yakima
Whitman
San Juan
Columbia
Garfield
Asotin
Kittitas
Lincoln
Adams
Douglas
Franklin
Skagit
Okanogan
Ferry
Chelan
Benton
Grant
Pend Oreille
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June 27, 1844
December 21, 1845
February 4, 1851
January 12, 1852
December 22, 1852
December 22, 1852
December 22, 1852
January 6, 1853
March 9, 1854
March 9, 1854
March 13, 1854
April 14, 1854
April 21, 1854
April 25, 1854
April 25, 1854
April 26, 1854
January 16, 1857
January 29, 1858
December 20, 1859
January 14, 1861
January 20, 1863
January 21, 1865
November 29, 1871
October 31, 1873
November 11, 1875
November 29, 1881
October 27, 1883
November 24, 1883
November 24, 1883
November 28, 1883
November 28, 1883
November 28, 1883
November 28, 1883
November 28, 1883
February 21, 1899
March 13, 1899
March 8, 1905
February 24, 1909
March 1, 1911
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