Notice: JavaScript is required for this content. The staff of the Greeting Card Association is available from 9:00 a.m. – 5:00 p.m. U.S. Mountain Time, Monday through Friday at our office in the suburban Denver, Colorado metro area. Greeting Card Association PO Box 3406, Englewood, CO 80155 Tel: 303-848-2522 Fax: 303-200-7099 gca@greetingcard.org For GCA’s W9, please click here.