Several studies of divorced and widowed women show increased odds of becoming poor following the termination of marriage. Both cross-sectional and longitudinal data suggest that the end of marriage is correlated with higher poverty rates. Less is know, however, about factors that influence economic well-being over time, and whether these factors are similar for widows and divorced women. This analysis uses data from the National Longitudinal Surveys cohort of mature women (1967-1982) to examine the probability of becoming poor after widowhood or divorce among mid-life women, and factors that seem to influence economic well-being. Findings show that 40% of widows and over 1/4 of divorced women fall into poverty for at least some time during the 1st 5 years after leaving marriage. The type of marital transition experienced by the woman is not a significant factor in economic well-being, but both age and prior economic standing have positive estimated effects.