This report was prepared for the Illinois Department of Human Services by Timothy P. Johnson and Ingrid Graf of the Survey Research Laboratory at the University of Illinois at Chicago, and coordinated by Chicago Coalition for the Homeless. This document reports the findings from a study designed to (1) assess the needs of unaccompanied homeless youth (UHY) in Illinois and (2) provide statewide estimates of the number of these youth in Illinois. For the purposes of this project, an unaccompanied homeless youth was defined as an individual age 21 or younger who, at the time of data collection, was not primarily in the care of a parent or legal guardian and who lacked a safe or stable living arrangement. Wards of the state or youth who had formed stable private living arrangements did not fit our definition. This study included two main data collection efforts: (1) a representative survey of service providers in Illinois who provide assistance to unaccompanied homeless youth and (2) a representative survey of UHY currently receiving services in Illinois.