This report investigates the differences in child care use patterns among groups of poor and employed single mothers experiencing three levels of housing stability: homeless/doubled up, at risk of homelessness, or stably housed. Comparisons are provided for types of child care arrangements used, reliability of child care arrangements, and use of child care subsidies. Analysis is based on longitudinal data for 1,836 low income families from the Fragile Families and Child Wellbeing Study, a nationally representative study tracking almost 5,000 mostly poor and urban families with young children born between 1998 and 2000.