This report discusses the federal response to support the runaway and homeless youth population, specifically the U.S. Interagency Council on Homelessness; the Runaway and Homeless Youth Program, administered by the Family and Youth Services Bureau; and other related programs. The report acknowledges that definitions of the terms “runaway” and “homeless youth” are not specified; however, both groups share the risk of having inadequate shelter and other provisions and may engage in harmful behaviors while away from a permanent home. These two groups also include “thrownaway” youth who are asked to leave their homes, as well as other vulnerable youth populations, such as current and former foster youth and youth with mental health issues. The term “unaccompanied youth” encompasses both runaways and homeless youth and is used in national data counts of the population. (author abstract modified)