The Roper Center For Public Opinion Research - iPoll This link opens in a new windowThe iPoll Databank is a comprehensive collection of public opinion survey datasets. The focus of the collection is on surveys from the United States, although the collection also includes surveys from Europe, Latin America and Asia. The collection includes datasets dating back as far as 1936 with over 800,000 questions and 25,000 studies in total. Users can search by keywords and interview dates.