This paper examines the economic resources of homeless adults using a unique data set from Los Angeles. The homeless rely on a variety of sources for income; the two most common sources are the government and the family. Over 58% received government transfers in the 30 days prior to the interview, while one-third had received cash assistance from a family member or friend. Familial transfers in the form of shared housing and meals also are important. While familial transfers buffer declines in income among the homeless, private support networks are not pervasive enough to overcome the severe difficulties the homeless face. Moreover, it is unclear why such a high share of the homeless do not participate in government assistance programs, although the evidence suggests that transaction costs are likely to be an important factor.