This report profiles, for the first time, the national phenomenon of day labor in the United States. Men and women looking for employment in open-air markets by the side of the road, at busy intersections, in front of home improvement stores and in other public spaces are ubiquitous in cities across the nation. The circumstances that give rise to this labor market are complex and poorly understood. In this report, we analyze data from the National Day Labor Survey, the first systematic and scientific study of the day-labor sector and its workforce in the United States.