Abstract This paper proposes the creation of an open digital platform—a “mayoral group chat”—where U.S. mayors can regularly exchange ideas, lessons learned, and insights about municipal governance. Focused on public and non-sensitive information, this platform would allow for transparent knowledge-sharing across cities of all sizes, enabling mayors to improve policies and initiatives by learning from each other’s experiences. Introduction Mayors across the U.S. deal with a wide range of uniq...