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Mail application/registration materials to the appropriate address below: For materials sent via U.S. mail: Certificate Program Applications/Registrations UW Extension Registration Services PO Box 45010 Seattle, WA 98145-0010 For materials sent via express or courier delivery only: Certificate Program Applications/Registrations UW Extension Registration Services 4311 11th Ave. NE, Suite 100 Seattle, WA 98105-4608 |