This paper presents the results of a study that finds that as many as two million unauthorized immigrants in the United States could have a path to permanent legal status. However, these immigrants may not know that they are eligible for legal status or be able to afford the costs. The two million figure is drawn from an analysis of data on 4,070 screened unauthorized immigrants from 12 states. The study highlights the profound impact that a national project to screen for legal status would have on the US unauthorized population, mixed-status families, and US communities, including growth in home ownership and increased tax revenues. The paper recommends the following: (1) a massive, nationwide legal screening and legalization effort; (2) a substantial increase in high-quality, low-cost legal service providers; (3) increased legal training focused on immigration law and eligibility screening; and (4) extensive community outreach and education, especially among under-resourced populations.