Mrs. Miller supported a large number of organizations and public projects. Following is a partial list, with links for those organizations or projects that have websites. She and her husband, Pendleton Miller, also formed the Pendleton and Elisabeth Miller Charitable Foundation.

• Burke Museum
• Center for Urban Horticulture
• Elisabeth C. Miller Library
• Freeway Park
• Garden Club of America
• Hiram M. Chittenden Locks
• Lake Washington Ship Canal Horticultural Improvements
• Miller Community Center
• Northwest Horticultural Society
• Operation Triangle (traffic islands in Seattle)
• Pacific Science Center Foundation
• Rhododendron Species Foundation
• Seattle Chinese Garden
• Seattle Department of Parks and Recreation
• Seattle Garden Club
• The Arboretum Foundation
• University of Washington School of Law
• Washington Roadside Council (Billboard Legislation)