The number of individuals claiming a nonreligious identity in the United States is on the rise, with one‐fourth of the overall U.S. public failing to identify with any of the major religious traditions. In this article, we examine whether religious disaffiliation structures social network formation in a social context in which religious identification (and religiosity) is a salient cultural marker. We take advantage of unique data on the personal networks of youth transitioning into a college where religion is a culturally salient facet of everyday life. We hypothesize that, if there is nonreligious homophily, it may result from an attraction of the disaffiliated to each other or from a repulsion away from the religiously affiliated. Results of exponential random graph models suggest that both mechanisms may be at play. We find that religious “Nones” and affiliated non‐Catholics are disproportionately more likely to form and maintain relationships with one another and are relatively less likely to form and maintain relationships with members of their respective religious out‐groups. We close by outlining the implications of our findings and delineating promising avenues for future research.