You can mail your payments to: Washington State Support Registry PO Box 45868 Olympia, WA 98504-5868 (phone 1-800-442-5437) or in person at: Division of Child Support 840 N Broadway, Bldg B Everett, WA.
You can also pay online or telephone, contact DCS to find out how at www.dshs.wa.gov and click on Child Support, and then How do I Pay my Child Support, or at 1-800-442-5437.