As part of the larger evaluation of the Hilton Foundation’s Homelessness initiative, Abt Associates examined how effective the Los Angeles region’s public housing authorities (PHAs) have been in using vouchers to help people leave homelessness, the extent to which voucher holders succeed in using the vouchers, the locations where they use vouchers, and the implications for the PHAs’ programs—who they serve and at what cost. This study focuses on 2016 through early 2020, before the onset of the COVID-19 pandemic.