Wash. Const. art. XXII, § 2

Until otherwise provided by law the representatives shall be divided among the several counties of the state in the following manner; the county of Adams shall have one representative; the county of Asotin shall have one representative; the county of Chehalis shall have two representatives; the county of Clarke shall have three representatives; the county of Clallam shall have one representative; the county of Columbia shall have two representatives; the county of Cowlitz shall have one representative; the county of Douglas shall have one representative; the county of Franklin shall have one representative; the county of Garfield shall have one representative; the county of Island shall have one representative; the county of Jefferson shall have two representatives; the county of King shall have eight representatives; the county of Klickitat shall have two representatives; the county of Kittitas shall have two representatives; the county of Kitsap shall have one representative; the county of Lewis shall have two representatives; the county of Lincoln shall have two representatives; the county of Mason shall have one representative; the county of Okanogan shall have one representative; the county of Pacific shall have one representative; the county of Pierce shall have six representatives; the county of San Juan shall have one representative; the county of Skamania shall have one representative; the county of Snohomish shall have two representatives; the county of Skagit shall have two representatives; the county of Spokane shall have six representatives; the county of Stevens shall have one representative; the county of Thurston shall have two representatives; the county of Walla Walla shall have three representatives; the county of Wahkiakum shall have one representative; the county of Whatcom shall have two representatives; the county of Whitman shall have five representatives; the county of Yakima shall have one representative.