Established in 1962, ICPSR is the world's largest archive of digital social science data. It's a leader in the area of research data management and teaching with data. Here you can find data files on a wide range of topics, from elections to education to health. Data files are freely accessible to members, and ASU is a member organization. You can also use their interface to search for studies.
Nearly all of the survey and other quantitative data collected by the Pew Research Center’s seven projects are freely available for secondary analysis by researchers. Each project has a “Dataset” page devoted to its available data.
Datasets are identified by survey topics, dates that the survey was conducted, and reports generated from the survey. Data are stored as SPSS.sav files. When applicable, additional files are included that provide the response values and labels for open-ended questions. A complete questionnaire and a readme file area are also included.
The GSS (General Social Survey), a data-collection program designed to both monitor social change within the United States and to compare the United States to other nations, is a major source of public opinion survey data for the United States. It is an almost annual, omnibus personal interview survey of U.S. households conducted by the National Opinion Research Center (NORC). The GSS contains a standard 'core' of demographic, behavioral, and attitudinal questions, plus topics of special interes
Roper Center Public Opinion Archives or iPoll is a comprehensive, up-to-date and the largest archives of US public opinion information.It is organized at the question level, providing the tools to sift through nearly a half million questions asked on national public opinion surveys, 1935 to present. The membership also includes on demand access to the full datasets required to conduct bivariate and multivariate analyses on archived surveys using RoperExpress.