Washington State Archives
520 Union Ave. SE
P.O. Box 40220
Olympia, WA 98504-0220
The central repository receives and catalogs materials for the entire state, and publishes a number of guides to its various collections, the titles of which can be found on its website. Records of a local government nature are collected and preserved in the five regional branch archives, each serving several counties as follows:
Eastern Regional Branch—Washington State Archives
Eastern Washington University
Cheney, WA 99004
Covers Adams, Asotin, Columbia, Ferry, Garfield, Lincoln, Oreille Pend, Spokane, Stevens, Walla Walla, and Whitman.
Central Regional Branch—Washington State Archives
Central Washington University, MS-7547
Ellensburg, WA 98926-7547
Covers Benton, Chelan, Douglas, Franklin, Grant, Kittitas, Klickitat, Okanogan, and Yakima.
Puget Sound Regional Branch—Washington State Archives
3000 Landerholm Circle SE, MS-N100
Bellevue, WA 98007-6484
Covers King, Kitsap, and Pierce.
Northwest Regional Branch—Washington State Archives
Western Washington University, MS-9123
Bellingham, WA 98225-9123
Covers Clallam, Island, Jefferson, San Juan, Skagit, Snohomish, and Whatcom.
Southwest Regional Branch—Washington State Archives
1129 Washington St. SE
P.O. Box 40238
Olympia, WA 98504-0238
Covers Clark, Cowlitz, Grays Harbor, Lewis, Mason, Pacific, Skamania, Thurston, and Wahkiakum.