Polling
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American National Election StudiesANES conducts national surveys of the American electorate in presidential and midterm election years. The ANES time-series now encompasses biennial election studies since 1948
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Cooperative Election StudyElection year surveys on general political attitudes, various demographic factors, assessment of roll call voting choices, political information, and vote intentions.
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General Social SurveyA biennial personal interview survey of U.S. households conducted by the National Opinion Research Center (NORC) and "is widely regarded as the single best source of data on societal trends". Data is collected in order to observe and document current opinions, attitudes, and behaviors.
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Odum InstituteThe Odum Institute has a large archive of public opinion data, including more than 1,000 Harris Polls from as early as 1958, the National Network of State Polls collection (775 studies from more than 25 states), the Carolina Poll (1977–2005), Monmouth University Polling Institute polls (2011+), the Southern Focus Poll (1992–2001), and some USA Today polls (1984–1993).
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Roper iPoll This link opens in a new windowNOTE: users need to create a personal account to download data and documents. A unique, rich data source for US public opinion topics. It includes 650,000 questions and answers from 1935 through last week, gathered from all the major polling organizations in the country (Gallup, Harris, Pew, etc.)
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World Values SurveyFounded in 1981, the World Values Survey is an international research program devoted to the scientific and academic study of social, political, economic, religious and cultural values of people in the world. Data is collected globally every 5 years by a comparative social survey. Surveys include questions related to general health, family structure, employment and much more. Maps, time series data, and country-specific responses can be downloaded as Excel spreadsheets or PDFs.
International Polling
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AfrobarometerAfrobarometer is a pan-African, non-partisan survey research network that conducts public attitude surveys on democracy, governance, the economy, and society.
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Arab BarometerThe largest repository of publicly available data on citizens' views in the Middle East and North Africa.
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Asian BarometerThe ABS is an applied research program that aims to gauge public opinion across Asia on issues such as political values, democracy, and governance.
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EurobarometerEurobarometer is the polling instrument used by the European Commission, the European Parliament and other EU institutions and agencies to monitor regularly the state of public opinion in Europe, starting in 1974.
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LatinobarómetroLatinobarómetro is an annual public opinion survey that involves some 20,000 interviews in 18 Latin American countries, representing more than 600 million inhabitants.
American Elections
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Klarner PoliticsState legislative election returns and other datasets.
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MIT Election Data + Science LabA clearinghouse for data sets that can fuel studies on elections and how they're conducted.
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DataverseHarvard's Dataverse contains over 30,000 datasets in the social sciences
International Elections
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Comparative Study of Electoral SystemsThe CSES is a collaborative program of research among election study teams from around the world. Participating countries and provinces include a common module of survey questions in their post-election studies. The resulting data are deposited along with voting, demographic, district and macro/electoral system variables.
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Constituency-Level Elections Archive (CLEA)The Constituency-Level Elections Archive (CLEA) is a repository of detailed election results at the constituency level for lower chamber and upper chamber legislative elections from around the world.
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Database of Political InstitutionsInstitutional and electoral results data such as measures of checks and balances, tenure and stability of the government, identification of party affiliation and ideology, and fragmentation of opposition and government parties in the legislature. The current version of the database expands its coverage to about 180 countries for 45 years, 1975-2020.
American Institutions (Presidency, Congress, Judicial Branch)
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American Presidency ProjectElection map data, newspaper endorsements, and more.
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Congressional Data in RLegislator characteristics, district information, roll call votes, OpenSecrets data, ideology measures, etc.
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Congressional Bills ProjectThe Congressional Bills Project is a relational database of over 400,000 public and private bills introduced in the U.S. House and Senate since 1947.
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VoteviewVoteview allows users to view every congressional roll call vote in American history on a map of the United States and on a liberal-conservative ideological map including information about the ideological positions of voting Senators and Representatives.
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The Supreme Court DatabaseOver two hundred pieces of information about each case decided by the Court between the 1791 and 2022 terms. Examples include the identity of the court whose decision the Supreme Court reviewed, the parties to the suit, the legal provisions considered in the case, and the votes of the Justices.
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Judicial Research InitiativeElectronic datasets of court cases and smaller datasets or measures of judicially relevant phenomena.
State and County Data
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Correlates of State PolicyThe Correlates of State Policy Project aims to compile, disseminate, and encourage the use of data relevant to U.S. state policy research, tracking policy differences across the 50 states and changes over time. We have gathered more than 3000 variables from various sources and assembled them into one large, useful dataset.
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Klarner PoliticsState legislative election returns, governors, economic and government finance datasets.
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County Health Rankings and RoadmapsFind national statistics, state-level data and technical documentation including changes to our measures, guidelines for comparing data across states, information about data years and sources and more.
More datasets
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ICPSR (Inter-university Consortium for Political and Social Research) This link opens in a new windowNOTE: users need to create a personal account to download data and documents. An international consortium of more than 750 academic institutions and research organizations, ICPSR maintains a data archive of more than 250,000 files of research in the social sciences. It hosts 21 specialized collections in education, aging, criminal justice, substance abuse, terrorism, and other fields from various countries. Qualitative studies can be downloaded as text documents while quantitative data can be downloaded as CSV files.
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ISPS Data ArchiveYale's ISPS Data Archive consists primarily of social science research based on experiments. The Archive is organized by study and includes the data, analysis code, requisite documentation, and other associated materials.
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Quality of GovernanceData on concepts related to quality of government, transparency and public administration for over 100 countries.
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re3data.orgA registry of research data repositories – includes over 1300 international collections of data.
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Linn and Lee's Data SourcesA comprehensive list of datasets on American politics and other topics, tailored to undergraduate research.
