A growing body of literature has begun to explore the individual identities, motivations, and school choices of middle-class, typically white, parents who choose to reside in socioeconomically and racially mixed central city neighborhoods. Drawing on qualitative research in three US cities, we argue that a focus on middle-class parents' collective engagement in schooling is particularly important in under-resourced urban contexts. In these environments, we show, middle-class parents' use of social networks often extends beyond basic information-sharing about school quality to encompass a range of activities undertaken with other families "like them" who have also chosen to enroll their children in an urban public school. We find that, in some instances, middle-class parents' collective actions can benefit an entire class or school. Yet in other instances, their activation of social capital can contribute to processes of social reproduction in urban schooling by excluding or marginalizing low-income students and their families.