This study examines the relationship between states and their cities and the impact of state activity on cities. To understand how states can help cities -- and thereby themselves -- succeed, the George Washington Institute of Public Policy and Cleveland State University’s Office of Economic Development began a study of state policies that contribute to successful urban performance. As background for this paper, seven states were visited. As a result of research in these states, a set of principles were identified that, when they serve as guides to state actions and policies, can help cities prosper and at the same time benefit all state residents.