This report questions how skills are distributed across the millennial population, focusing on the size and demographic characteristics of U.S. millennials with low literacy and numeracy skills, and the resulting impact on social and economic outcomes. The authors do this in part by examining the issue of "disconnected youth," a term typically applied to those aged 16-24 who are not employed or engaged in formal education or training. In this report, the authors first shift the emphasis of "disconnection" from a concern with attachments to employment and education to one that includes human capital, or skill level. The authors use Programme for the International Assessment of Adult Competencies (PIAAC) skills data to provide a brief international context for the performance of U.S. millennials, followed by an in-depth analysis of the size and demographic dimensions of the problem of low skills in this cohort. The authors argue that low skills are correlated to a larger sense of disconnection and disengagement from political and social life. The author's findings underscore that literacy and numeracy are not only connected with economic returns but play a critical role in uniting our society and democracy.