The majority of Americans live and work in suburbs, but the social problems arising in these communities are rarely studied by sociologists. Far more scholarly attention is devoted to understanding the distinctive character of urban communities. This review directs attention to three emerging trends affecting the nation's suburbs disproportionately: the suburbanization of poverty, the settlement of post-1965 immigrants in the suburbs, and the impact of reverse migration to the South on black suburbanization. The review provides a critical discussion of the valuable contributions demographers have made to our general understanding of these trends, then it engages the work of ethnographers to assess the processes underlying these outcomes. These emerging trends constitute the basis for a robust research agenda rooted in the sociology of suburbs.