Historically, afterschool programs have functioned independently with little coordination among provider organizations or agencies, and public and private funders operating in isolation. Research conducted by the National League of Cities for The Wallace Foundation profiled 27 cities that were known to be taking steps to improve coordination among their afterschool providers, creating citywide systems designed to support high quality programs and increase access. This research prompted questions about the growth and characteristics of afterschool coordination nationwide. What is the prevalence of afterschool coordination? To what extent have large cities adopted key afterschool coordination components? What are the roles of the mayor or city manager, city agencies, and other organizations in providing reliable information and affirming a commitment to quality? This exploratory study answers these and other questions and provides a first-ever look at afterschool coordination and system-building in large cities across country.