This special issue explores the forms of coexistence that emerge in what we call ‘marginal hubs’: sites that appear geographically or politically marginal, but which emerge as areas of intense and often volatile sociability, including border posts, container markets, industrial workshops, and pilgrim encampments. Such sites, which often come into being suddenly and are remote from the great urban centres, do not fit easily either within the framework of the Asian urban nor of the continent's villages and small towns. By exploring the forms of sociability that are important to everyday life in such places, we seek to widen the spectrum of settings that are recognized by scholars across the humanities and social sciences as having the potential to offer productive insights into understanding how heterogeneity is handled in Asia and beyond. This Introduction sets out the theoretical stakes of such an approach, as well as introducing the articles in this special issue.