The Integrated Fertility Survey Series (IFSS) is a project of the Population Studies aiming in view to produce a harmonized dataset of U.S. family and fertility surveys spanning five decades (1955-2002). IFSS integrates data from ten underlying component studies of family and fertility encompassing the Growth of American Families (GAF) in 1955 and 1960; National Fertility Surveys (NFS) in 1965 and 1970; as well as National Surveys of Family Growth (NSFG) in 1973, 1976, 1982, 1988, 1995, and 2002. The first release contains harmonized sociodemographic variables for all respondents from all ten component studies, including those related to marital status, race and ethnicity, etc. Thus it provides access to researchers, educators, students, policy makers, and others with a data resource to examine issues related to families and fertility in the United States. Potential users can download original/ harmonized datasets (along with documentation) and numerous analytic tools make it possible to quickly and easily explore the data and obtain information about changes in behaviors and attitudes across time.