This report offers estimates of US foreign-born populations that are eligible for special legal status programs and those that would be eligible for permanent residence (legalization) under pending bills. It seeks to provide policymakers, government agencies, community-based organizations (CBOs), researchers, and others with a unique tool to assess the potential impact, implement, and analyze the success of these programs. The report views timely, comprehensive data on targeted immigrant populations as an essential pillar of legalization preparedness, implementation, and evaluation. The report and the exhaustive estimates that underlie it, represent a first attempt to provide a detailed statistical profile of beneficiaries of proposed major US legalization programs and special, large-scale legal status programs.