In 2003, there were about 3,787 regional, national, and international organizations within the state.
Among the associations with headquarters in Washington are the American Plywood Association and the American Academy on Mental Retardation, Tacoma; the Center for the Defense of Free Enterprise and the Citizens Committee for the Right to Keep and Bear Arms, Bellevue; the Pacific International Trapshooting Association, Puyallup; the Northwest Mining Association, Spokane; and the Northwest Fisheries Association, the International Association for the Study of Pain, the International Conference of Symphony and Opera Musicians, and the Mountaineers, all located in Seattle. The national offices of the Freedom Socialist Party are based in Seattle.