The Washington-Northern Idaho Council of Churches was first incoporated in 1935, with Dr. Gertrude Apel serving as an executive staff member. He also served on the executive staff in the Seattle Federation of Churches until 1958, at which point the state council and King County Council of Churches split after a consultation with the long-time ecumenical leader, Ross Sanderson. In 1967, the state council's title was changed to the Washington Council of Churches and later, in 1975, it was renamed the Washington Association of Churches
The Washington Association of Churches (WAC) continues to serve as an association of 10 Christian denominations and 11 ecumenical organizations who live and work together on the task of ecumenism in Washington State. Since 1975, WAC has served as a focal point for dialogue, advocacy, action and reflection, facilitating meetings between member churches and forming partnerships with a diverse range of organizations and communities
From the description of Washington Association of Churches records, 1935-1996 (Unknown). WorldCat record id: 123953879
