Results archive / Iowa
Iowa election results
President since 1976, counties since 2000, US Senate since 1976.
President
Electoral votes
1976 R 81980 R 81984 R 81988 D 81992 D 71996 D 72000 D 72004 R 72008 D 72012 D 62016 R 62020 R 62024 R 6
2024 Trump+13.2
Counties
Democratic lead<55-1010-2020+
Republican lead<55-1010-2020+
No dataSwing
Towards the Democrat<22-55-1010+
Towards the Republican<22-55-1010+
No dataUS Senate
2022
Chuck Grassley (R)56.0%
Michael Franken (D)43.8%
2020
Joni Ernst (R)51.7%
Theresa Greenfield (D)45.2%
2016
Chuck Grassley (R)60.1%
Patty Judge (D)35.7%
2014
Joni Ernst (R)52.1%
Bruce Braley (D)43.8%
2010
Chuck Grassley (R)64.4%
Roxanne Conlin (D)33.3%
2008
Tom Harkin (D)62.7%
Christopher Reed (R)37.3%
2004
Charles E. Grassley (R)70.2%
Arthur Small (D)27.9%
2002
Tom Harkin (D)54.2%
Greg Ganske (R)43.8%
1998
Charles E. Grassley (R)68.4%
David Osterberg (D)30.5%
1996
Tom Harkin (D)51.8%
Jim Lightfoot (R)46.7%
1992
Chuck Grassley (R)69.6%
Jean Lloyd-Jones (D)27.2%
1990
Tom Harkin (D)54.5%
Thomas J. Tauke (R)45.4%
1986
Charles E. Grassley (R)66.0%
John O. Roehrick (D)33.6%
1984
Tom Harkin (D)55.5%
Roger W. Jepsen (R)43.7%
1980
Charles E. Grassley (R)53.5%
John Culver (D)45.5%
1978
Roger W. Jepsen (R)51.1%
Dick Clark (D)47.9%
MEDSL and VEST results files: fixed historic releases. 2026 Senate counts: uncertified.
Sources
- National Archives, Office of the Federal Register: Electoral College results 1976-2024 (Public domain (US government work))
- MIT Election Data and Science Lab, U.S. President 1976-2024, Harvard Dataverse (CC0 1.0)
- MIT Election Data and Science Lab, County Presidential Election Returns 2000-2016 (GitHub copy, commit f44e3fc; the dataset is CC0 1.0 on Harvard Dataverse, doi:10.7910/DVN/VOQCHQ) (CC0 1.0)
- Connecticut Secretary of the State, 2012 presidential election results by town (CT Election History), summed to the eight legacy counties by PollCheck (Official public records)
- Voting and Election Science Team, 2020 Precinct-Level Election Results, Harvard Dataverse (precincts summed to counties by PollCheck) (CC BY 4.0)
- PollCheck 2024 county totals (us_site/house_pres.py): MEDSL 2024 precinct returns (CC0 1.0) plus the state sources named in county_pres_2024.json (CC0 1.0 (MEDSL rows))
- US Census Bureau cartographic boundary files: counties 2020 (1:500,000) and 2024 (1:5,000,000) (Public domain)
- US Census Bureau state legislative districts (lower chamber), Alaska: TIGER/Line 2010 (2000 and 2010 districts) and cartographic boundary files 2013, 2018 and 2023 (Public domain)
- Maine Bureau of Corporations, Elections and Commissions, 2024 General Election, President and Vice President (certified, corrected 5 Dec 2024) (Maine government record)
- New York State Board of Elections, 2004 General Election, President and Vice President, results by county (New York government record)
- New York State Board of Elections, President and Vice-President Election Returns Nov. 6, 2012 (dated 20 Mar 2013, Kings update 9 Jun 2013), copy hosted by the American Presidency Project (New York government record)
- MIT Election Data and Science Lab, U.S. Senate statewide 1976-2024, Harvard Dataverse (CC0 1.0)
- State election office counts as read by the PollCheck midterms results feed (us_midterms_2026/data/results.json); uncertified (Official public records)
- us-atlas 3.0.1 counties-albers-10m (Census 2017 county boundaries) (ISC)
- us-atlas 3.0.1 states-albers-10m.json (US Census Bureau cartographic boundary files 2017; ISC licence)
Final results.