Advancing the sign industry in Kansas, Missouri, and Oklahoma is our mission. The Tri-State Sign Association is an affiliate of the International Sign Association and represents a majority of all companies engaged in the design, sale, manufacture, installation and service of on-premise signs. Membership includes sign companies, suppliers of sign materials, components, and equipment, and professional associates. Companies in the Sign Company Classification that join the Tri-State Sign Association (TSSA), automatically become a member of the International Sign Association (ISA) — these two powerful resources provide access to the connections, training and information needed for sign companies to grow in today's economy.