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| Year | Type | Turnout  | Winner | Runner-Up |
Other | Total Votes | Diff | PSV |
|---|
|
2020 |
S2 |
68% |
Joni Ernst* (R) |
1,667 |
63.7% |
Theresa Greenfield (D) |
853 |
32.6% |
97 [+] |
3.7% |
2,617 |
12 |
0.16% |
| [-] Other candidates in 2020:
Rick Stewart (Libertarian) 70 (2.7%);
Suzanne Herzog (I) 25 (1.0%);
Other (Write-in) 2 (0.1%);
|
|
2018 |
G |
51% |
Kim Reynolds* (R) |
1,293 |
65.5% |
Fred Hubbell (D) |
643 |
32.6% |
38 [+] |
1.9% |
1,974 |
15 |
0.15% |
| [-] Other candidates in 2018:
Jake Porter (Libertarian) 30 (1.5%);
Gary Siegwarth (Clean Water) 6 (0.3%);
Other (Write-in) 2 (0.1%);
|
|
2016 |
S3 |
62% |
Charles Grassley* (R) |
1,688 |
70.5% |
Patty Judge (D) |
613 |
25.6% |
94 [+] |
3.9% |
2,395 |
10 |
0.16% |
| [-] Other candidates in 2016:
Charles Aldrich (Libertarian) 65 (2.7%);
Other (Write-in) 29 (1.2%);
|
|
2014 |
S2 |
43% |
Joni Ernst (R) |
1,084 |
65.4% |
Bruce Braley (D) |
510 |
30.8% |
63 [+] |
3.8% |
1,657 |
13 |
0.15% |
| [-] Other candidates in 2014:
Rick Stewart (I) 37 (2.2%);
Douglas Butzier (Libertarian) 12 (0.7%);
Bob Quast (I) 7 (0.4%);
Ruth Smith (I) 7 (0.4%);
Other (Write-in) 0 (0.0%);
|
|
2014 |
G |
43% |
Terry Branstad* (R) |
1,195 |
71.5% |
Jack Hatch (D) |
423 |
25.3% |
54 [+] |
3.2% |
1,672 |
12 |
0.15% |
| [-] Other candidates in 2014:
Lee Hieb (Libertarian) 23 (1.4%);
Jim Hennager (New Independent) 19 (1.1%);
Jonathan Narcisse (Iowa) 11 (0.7%);
Other (Write-in) 1 (0.1%);
|
*: incumbent +: ran on additional party lines Type: G: Governor; S1,S2,S3: Senate Class 1, 2 or 3
italics: special election RO: runoff election PSV: percent of state vote
209 from 2010
)
356.5% 
101.9%