GSS gathers data on contemporary American society in order to monitor and explain trends and constants in attitudes, behaviors, and attributes. Hundreds of trends have been tracked since 1972.
The Inter-university Consortium for Political and Social Research (ICPSR) was founded in 1962 for the purpose of acquiring and preserving social science data.
The largest source for opinion polling data. Data covers 1935 to the present on a broad range of topics.
Questions can be searched by keyword, topic, date, or source. The database includes polls from many sources: major news organizations (CBS, ABC, Associated Press, etc.), public opinion research centers (Gallup, Harris, Pew, etc.), and major academic and commercial pollsters. Only polls of the United States population at the national level are included, but international datasets are available for immediate download.