The Lewis County Historical Museum
- Depicts the early settlements and pioneer life in the area, one of the first areas settled in the region and the oldest county in Washington State.
- http://www.lewiscountymuseum.org/

Black Diamond Museum
- Tools and equipment from coal mining, and household items from life 100 years ago.
- http://www.blackdiamondmuseum.org/

Ahtanum Valley Museum
- Organized to preserve the history of the area surrounding the Ahtanum Creek drainage from the head of the valley to Union Gap.
- http://ahtanumvalleymuseum.org

Chewelah Museum
- Features collection of over 800 photographs of the area, mining equipment, historic radio equipment, a telephone directory display, and local artifacts. Includes hours and directions to the location in Chewelah, Washington, United States.
- http://www.chewelahmuseum.org/

History Museums of Ritzville
- Features exhibits housed in a period railroad depot and a restored physician's home. Includes details of exhibits, hours and suggested donations.
- http://ritzville-museums.org/

Kittitas County Historical Museum
- Non-profit organization dedicated to collecting and preserving artifacts of the region. Includes a directory of staff members and volunteers, events, hours, a list of members, a membership form, and volunteer opportunities. Located in Ellensburg.
- http://www.kchm.org

Pacific County Historical Society and Museum
- Private, nonprofit, charitable organization devoted to preserving and presenting the history of this region. Includes a virtual tour, FAQs, hours, and directions to the location in South Bend.
- http://www.willapabay.org/~museum/

Washington State History Museum
- Explore the museum's Hall of Washington History and discover a new view of the past, from frontier towns to modern technology. Includes events, programs, membership details, and publications. Located in Tacoma.
- http://www.wshs.org/

Yakima Valley Museum
- Offers displays focusing on natural history, Native American culture, early pioneer life, and the roots and development of the Valley's fruit industry. Includes events, memberships, programs, hours, tours, and directions.
- http://yakimavalleymuseum.org/

Whatcom Museum of History and Art
- Dedicated to the collection, preservation, exhibition and interpretation of this region's art and cultural history. Includes information about tours, research grants, collections, a gift shop, and employment opportunities. Located in Bellingham.
- http://www.whatcommuseum.org/