ABSTRACT: In November 2002 the voters of Los Angeles soundly rejected Proposition F which, if approved, would have authorized the secession of the San Fernando Valley in order to constitute a city independent of Los Angeles. This article attempts to delineate the interplay of social, economic, and political conditions related to support for secession by examining the results of a Los Angeles Times survey conducted one week prior to the vote. Because an exit poll was not taken following the vote, these data provide the most proximate evidence for the views of voters shortly before casting their ballots. The analysis of the data identifies distinctive social bases of support for secession in the San Fernando Valley that contrast with those outside the region. The results are interpreted in the context of Sonenshein's discussion of the role of coalition formation in urban politics.