Social connectedness has been shown to be related to health and well-being, yet there is little knowledge about its developmental and intergenerational origins. We examine the childhood, family, and neighbourhood origins of social connectedness in young adulthood in a cohort of African American children (N=1242) from Chicago followed since 1966. The five measures of social connections are: political involvement, organizational membership, church involvement, family ties, and friend ties. In multivariate analyses, predictors of social connectedness were found across the life course: first grade social adaptation to school, childhood family resources, family social participation, adult neighbourhood characteristics, social class, and marital status. We conclude that adult social connections have roots in childhood behaviour and social involvement, family resources and family social connections as well as one's own resources and the neighbourhood where one lives.