Social capital has recently become a guiding theoretical framework for family interventions in low-income neighborhoods. In the context of the Annie E. Casey Foundation's Making Connections initiative, this research uses hierarchical linear modeling to examine how neighborhood characteristics and resident participation affect bonding social capital in low-income neighborhoods. Findings demonstrate that participation, homeownership, and neighborhood stability are associated with bonding social capital. Additionally, significant interactions exist between individual characteristics and neighborhood income on bonding social capital.