Poverty is about a lack of money, but it's not only about that. As a lived experience, poverty is also characterized by ill health, insecurity, discomfort, isolation, and more. To put it another way: Poverty is multidimensional, and its dimensions often cluster together to intensify the negative effects of being poor. In this first of a two-part series, Richard Reeves, Edward Rodrigue, and Elizabeth Kneebone examine the "clustering" of five dimensions of poverty--household income, education, concentrated spatial poverty, health insurance, and employment--within a large sample of the American population. Understanding the different patterns and clusters of disadvantage is an important step towards understanding inequality in its broadest sense. In particular, a multidimensional approach further illuminates the yawning race gaps that afflict the U.S., and the need for concerted action to eliminate them. The report includes the appendix: Previous Studies of Multidimensional Poverty: Dimensions, Indicators, and Data Sources.