Voting and Elections

Biannual compilations of the official federal election results obtained from each state’s election office, including the primary, runoff, and general election results for the U.S. Senate, the U.S. House of Representatives and, when applicable, U.S. President from 1982 to the present

National election results and maps for presidential elections from 1789 to the present, as well as U.S. Senate and gubernatorial elections from 1990 to the present

Presidential election data from 1789-present

Maps of electoral college votes back to 1789, voting history, and trends by state

Information on the United States electoral system, including election statistics, laws, and research reports

Official state-by-state vote counts in federal elections from 1920 through 2018 from the U.S. House of Representatives

Electoral votes, popular votes, electors, and certificates of past presidential elections

State, county, and district level election returns for all recent state and federal elections in the United States

Election-related datasets from both the MIT Election Lab itself and third-party contributors, with varying coverage ranges and levels of granularity

Open-access datasets about U.S. and foreign elections; formats, methodologies, coverage dates, and levels of granularity vary

Information on reported voting and registration by various demographic and socioeconomic characteristics, as collected in November during Congressional and Presidential election years by the United States Census Bureau Current Population Survey

Research and data aimed at improving voter experience and supporting election administrators

Ballot measures from 2007 to present by state, year, and issue category

Research and data resources on women's participation in American politics. Check the "Election Watch" section for detailed information on past and upcoming election cycles

Campaign contributions and lobbying data to track money in U.S. politics and its effect on elections and public policy