The rapid increase in the number of unmarried cohabiting couples, indi
cated by recent evidence, is crucial to our understanding of changing
marriage patterns. The levels and patterns of entry into cohabitation
have been well documented over the last two decades, but little is kno
wn about the outcomes of nonmarital cohabitation. In this study we exa
mine two competing outcomes of cohabitation relationships: union separ
ation and legalization of the union through marriage. Our results show
that the hazard rate of union dissolution is affected particularly by
gender, fertility status, partner's marital status, religion, age at
start of cohabitation, year cohabitation commenced, and region.