National & state level
- Voter registraion & turnout
- 1787-present: United States Elections Project (Dr. Michael P. McDonald, University of Florida)
- Electoral college results
- 1892-present: US National Archives
- Official results for Senate & House of Representatives
- 1920-present: US House of Representatives, Office of the Clerk (PDF format)
- President
- 1824-2012: Dave Leip's Election Atlas
Congressional district level
- Voter registration & turnout
- 1964-present: Census Bureau. Older years are in PDF format only.
- President
- 2016-2020: Dave Leip's Election Atlas
County level
- President
- 1912-2020: Dave Leip's Election Atlas
- 1824-1968: ICSPR (must set up an account using U of T email address)
- House of representatives:
- 1992-2020: Dave Leip's Election Atlas
- 1824-1968: ICSPR (must set up an account using U of T email address)
- Senate:
- 1990-2020: Dave Leip's Election Atlas
- 1824-1968: ICSPR (must set up an account using U of T email address)
- Governor:
- 1993-2021: Dave Leip's Election Atlas
- 1824-1968: ICSPR (must set up an account using U of T email address)
- Voter registration & turnout data
- 1992-2020: Dave Leip's Election Atlas
Precinct Level
- 2018 midterm: MIT Election Data + Science Lab (via github)
- 2016: MIT Election Data + Science Lab - President, House of Representatives, & Senate
- 2014: Harvard Election Data Archive
- 2002-2012: Harvard Election Data Archive
- Select elections between 2012 & 2020 are available as Shapefiles from the United States Elections Project (Dr. Michael P. McDonald, University of Florida)
- Select elections between 1992-2020: Dave Leip's Election Atlas (Data available for each precinct varies)
Polling data & voting behaviour studies
- American National Election Studies (ANES) (must set up a free account to access)
- ANES via ICPSR (must set up an account using U of T email address)
- Roper Centre - Elections & Presidents