Third grade children (N = 404) and their mothers completed questionnaires and participated in interviews designed to identify children's friendships across multiple contexts, determine levels of social network closure for these friendships, and assess child well-being. Cluster analyses revealed distinct patterns in the contexts in which children's friendships were maintained. Closure was highest for children whose friendship clusters heavily represented relatives as friends and lowest when friends were from schools and the broader community. Intermediate levels of closure were observed for the clusters of neighborhood friends and friends from church and school. Both friendship cluster and, to some extent, ethnicity moderated associations between closure and indicators of well-being.