List of United States Senators from Iowa

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This page displays current and historical information pertaining to the U.S. Senate delegation from Iowa.

Current members

The current members of the U.S. Senate from Iowa are:

Office	Name	Party	Date assumed office	Date term ends
U.S. Senate Iowa	Joni Ernst	Republican	January 3, 2015	January 3, 2027
U.S. Senate Iowa	Chuck Grassley	Republican	January 3, 1981	January 3, 2029

Election history

Class II

Senators in Class II were elected to office in the November 2020 general election, unless they took their seat through appointment or special election. Class II terms run from the beginning of the 117th Congress on January 3, 2021, to the end of the 119th Congress on January 3, 2027.

2020

General election

General election for U.S. Senate Iowa

Incumbent Joni Ernst defeated Theresa Greenfield, Rick Stewart, and Suzanne Herzog in the general election for U.S. Senate Iowa on November 3, 2020.

	Candidate	%	Votes
✔	Joni Ernst (R)	51.7	864,997
	Theresa Greenfield (D)	45.2	754,859
	Rick Stewart (L)	2.2	36,961
	Suzanne Herzog (Independent)	0.8	13,800
	Other/Write-in votes	0.1	1,211

	Incumbents are bolded and underlined. The results have been certified. Source	Total votes: 1,671,828
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Democratic primary election

Democratic primary for U.S. Senate Iowa

Theresa Greenfield defeated Michael Franken, Kimberly Graham, Eddie Mauro, and Cal Woods (Unofficially withdrew) in the Democratic primary for U.S. Senate Iowa on June 2, 2020.

	Candidate	%	Votes
✔	Theresa Greenfield	47.7	132,001
	Michael Franken	24.9	68,851
	Kimberly Graham	15.0	41,554
	Eddie Mauro	11.0	30,400
	Cal Woods (Unofficially withdrew)	1.2	3,372
	Other/Write-in votes	0.2	514

	There were no incumbents in this race. The results have been certified. Source	Total votes: 276,692
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Republican primary election

Republican primary for U.S. Senate Iowa

Incumbent Joni Ernst advanced from the Republican primary for U.S. Senate Iowa on June 2, 2020.

	Candidate	%	Votes
✔	Joni Ernst	98.6	226,589
	Other/Write-in votes	1.4	3,132

	Incumbents are bolded and underlined. The results have been certified. Source	Total votes: 229,721
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Withdrawn or disqualified candidates

Paul Rieck (R)

2014

On November 4, 2014, Joni Ernst (R) won election to the U.S. Senate. She defeated Bruce Braley (D) and four minor-party candidates in the general election.

**U.S. Senate, Iowa General Election, 2014**
Party		Candidate	Vote %	Votes
	Republican	Joni Ernst	52.1%	588,575
	Democratic	Bruce Braley	43.8%	494,370
	Independent	Rick Stewart	2.4%	26,815
	Libertarian	Douglas Butzier	0.7%	8,232
	Independent	Ruth Smith	0.5%	5,873
	Independent	Bob Quast	0.4%	4,724
	Write-in	Other	0.1%	1,111
Total Votes				1,129,700
Source: Iowa Secretary of State Official Results

2008

U.S. Senate, Iowa General Election, 2008
Party		Candidate	Vote %	Votes
	Democratic	Tom Harkin Incumbent	62.7%	941,665
	Republican	Christopher Reed	37.3%	560,006
	N/A	Write-ins	0.1%	1,247
Total Votes				1,502,918

2002

On November 5, 2002, Tom Harkin won re-election to the United States Senate. He defeated Greg Ganske (R), Richard J. Moore (L), Timothy A. Harthan (Iowa Green Party) in the general election.^[1]

U.S. Senate, Iowa General Election, 2002
Party		Candidate	Vote %	Votes
	Democratic	Tom Harkin incumbent	54.2%	554,278
	Republican	Greg Ganske	43.8%	447,892
	Libertarian	Richard J. Moore	0.9%	8,864
	Green	Timothy A. Harthan	1.1%	11,340
	N/A	Write-in	0.1%	701
Total Votes				1,023,075

1996

On November 5, 1996, Tom Harkin won re-election to the United States Senate. He defeated Jim Lightfoot (R), Fred Gratzon (Natural Law), Sue Atkinston (Nomination by Petition), Joe Sulentic (Nomination by Petition) and Shirley E. Pena (Socialist Workers) in the general election.^[2]

U.S. Senate, Iowa General Election, 1996
Party		Candidate	Vote %	Votes
	Democratic	Tom Harkin incumbent	51.8%	634,166
	Republican	Jim Lightfoot	46.7%	571,807
	Natural Law	Fred Gratzon	0.3%	4,248
	Nomination by Petition	Sue Atkinson	0.8%	9,768
	Nomination by Petition	Joe Sulentic	0.2%	1,941
	Socialist Workers	Shirley E. Pena	0.2%	1,844
	N/A	Write-in	0%	280
Total Votes				1,224,054

Class III

Senators in Class III were elected to office in the November 2022 general election, unless they took their seat through appointment or special election. Class III terms run from the beginning of the 118th Congress on January 3, 2023, to the end of the 120th Congress on January 3, 2029.

2022

See also: United States Senate election in Iowa, 2022