Gallup Analytics provides access to trended data for the U.S. back to the 1930's and a decade of data from more than 160 countries. It includes data sources from Gallup World Poll, Gallup Daily Tracking, and Gallup Brain.

The iPOLL Databank from the Roper Center Public Opinion Archives focuses on national scope surveys and contains not only the complete question text and responses to half a million questions from as far back as 1935, but also information such as study abstracts, links to questionnaires, datasets and citation information where available.

Polling the Nations is a comprehensive collection of public opinion material from the United States and abroad. It contains the full text of some 400,000 questions and responses on 4,500 topics.

Covers a wide range of topics: elections, Congress, the presidency, and the judiciary, information on the media, campaign finances; foreign, social, and economic policy; and a variety of issues related to state and local government. Coverage is not limited to "hard" data, rankings of public officials' reputations, content analyses of media coverage, and public opinion data about policy issues are also included.