This article addresses a debate about the relationship of singlehood and informal ties—singlehood as isolating versus integrative—and evaluates structural explanations for this relationship, focusing on life course characteristics and socioeconomic resources. Using the National Survey of Families and Households (1992–1994) and the General Social Survey (2000, 2004, 2006, 2012), we examine ties to relatives, neighbors, and friends among U.S. adults. We find that single individuals are more likely to frequently stay in touch with, provide help to, and receive help from parents, siblings, neighbors, and friends than the married. These differences between the single and the married are more prominent for the never married than for the previously married, suggesting that marriage extends its reach after it ends. Being single increases the social connections of both women and men. Overall, much of the positive relationship between singlehood and social ties remains even when we take into account structural explanations. We conclude that instead of promoting marriage, policy should acknowledge the social constraints associated with marriage and recognize that single individuals have greater involvement with the broader community.