City of Seattle, Office of the City Clerk
600 Fourth Ave., Room 104, PO Box 94728
Seattle, WA 98124
Tel: 206-684-8344
E-mail: clerk@seattle.gov
Fax: 206-386-9025
There is no residency requirement for registrants. Open to opposite- and same-sex couples. Notarized applications are accepted by mail when accompanied by appropriate payment.