This research examines recent trends in the suburbanization of poor non-Latino Whites, Blacks, and Asians, and Latinos of all races in the United States. The authors find strong associations between a temporally lagged measure of suburban housing supply and poverty suburbanization during the period 2006–2010 for all groups, but these associations are largely attenuated by similarly lagged controls for suburban affordable housing and employment, as well as for other characteristics of metropolitan areas. Findings indicate that poor non-Latino Whites and Asians have higher suburbanization rates in metropolitan areas with higher levels of suburban employment, while the suburbanization of the Black and Latino poor is more strongly related to the availability of affordable suburban housing. Increases in housing supply are associated with change in poverty suburbanization over time for Whites, Blacks, and Latinos. In addition, increases in affordable rental housing are associated with increases in the suburbanization of the Latino poor.