This statistical profile of the foreign-born population is based on Pew Hispanic Center tabulations of the Census Bureau's 2007 American Community Survey (ACS). The ACS is the largest household survey in the United States, with a sample of about 3 million addresses. It covers virtually the same topics as those in the long form of the decennial census. The ACS is designed to provide estimates of the size and characteristics of the resident population, which includes persons living in households and, for the first time, persons living in group quarters. Read the complete Statistical Portrait of the Foreign-Born Population in the United States, 2007 on the Pew Hispanic Center Web site.