| Year | Executive offices | General Assembly | United States Congress | Electoral votes |
|---|
| Governor | Lt. Governor | Sec. of State | Attorney Gen. | Auditor | Treasurer | Sec. of Ag. | State Senate | State House | U.S. Senator (Class II) | U.S. Senator (Class III) | U.S. House |
|---|
| 1921 | Nathan E. Kendall(R) | John Hammill(R) | Walter C. Ramsay(R) | Ben Gibson(R) | Glenn C. Haynes(R) | William J. Burbank(R) | no such office | 48R, 2D | 101R, 6D, 1I | William S. Kenyon(R) | Albert B. Cummins(R) | 11R | |
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| 1922 | Smith W. Brookhart(R) |
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| 1923 | Raymond W. Cassidy(R) | 46R, 4D | 91R, 16D, 1I |
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| 1924 | James E. Thomas(R) | R. G. Clark(R) | Calvin Coolidge/ Charles G. Dawes(R) Y |
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| 1925 | John Hammill(R) | Clem F. Kimball(R) | J. C. McClune(R) | Raymond E. Johnson(R) | Mark G. Thornburg(R) | 45R, 4D, 1I | 101R, 7D |
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| 1926 | Daniel F. Steck(D) |
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| 1927 | John Fletcher(R) | J. W. Long(R) | 48R, 1D, 1ID | 95R, 13D | Smith W. Brookhart(R) |
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| 1928 | Arch W. McFarlane(R) | Edward McMurray Smith(R) | Herbert Hoover/ Charles Curtis(R) Y |
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| 1929 | 48R, 2D | 96R, 12D |
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| 1930 |
|---|
| 1931 | Dan W. Turner(R) | G. C. Greenwalt(R) | 44R, 6D | 71R, 37D | L. J. Dickinson(R) | 10R, 1D |
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| 1932 | C. Fred Porter(R) | Franklin D. Roosevelt/ John Nance Garner(D) Y |
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| 1933 | Clyde L. Herring(D) | Nelson G. Kraschel(D) | Ola Babcock Miller(D) | Edward L. O'Connor(D) | Charles W. Storms(D) | Leo J. Wegman(D) | Ray Murray(D) | 25D, 25R[h] | 76D, 32R | Louis Murphy(D) | 6D, 3R |
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| 1934 | 26R, 24D[i] |
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| 1935 | 28D, 22R | 58D, 50R |
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| 1936 | 26D, 24R[j] |
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| 1937 | Nelson G. Kraschel(D) | John K. Valentine(D) | Robert E. O'Brien(D) | John H. Mitchell(D) | Thomas L. Curran(D) | 28R, 22D | 54D, 54R[k] | Clyde L. Herring(D) | Guy Gillette(D) | 5D, 4R |
|---|
| 1938 | 29R, 21D[l] |
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| 1939 | George A. Wilson(R) | Bourke B. Hickenlooper(R) | Earl G. Miller(R) | Fred D. Everett(R) | C. B. (Chet) Akers(R) | Willis Bagley(R) | Mark G. Thornburg(R) | 38R, 12D | 89R, 19D | 7R, 2D |
|---|
| 1940 | Wendell Willkie/ Charles L. McNary(R) N |
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| 1941 | John M. Rankin(R) | 45R, 5D | 87R, 21D |
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| 1942 | 8R, 1D |
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| 1943 | Bourke B. Hickenlooper(R) | Robert D. Blue(R) | Wayne M. Ropes(R) | John M. Grimes(R) | Harry D. Linn(R) | 98R, 10D | George A. Wilson(R) | 8R |
|---|
| 1944 | Thomas E. Dewey/ John W. Bricker(R) N |
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| 1945 | Robert D. Blue(R) | Kenneth A. Evans(R) | 91R, 17D | Bourke B. Hickenlooper(R) |
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| 1946 |
|---|
| 1947 | Rolo H. Bergeson(R) | Robert L. Larson(R) | 44R, 6D | 98R, 10D |
|---|
| 1948 | Harry S. Truman/ Alben W. Barkley(D) Y |
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| 1949 | William S. Beardsley(R)[m] | Melvin D. Synhorst(R) | 43R, 7D | 79R, 29D | Guy Gillette(D) |
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| 1950 | Clyde Spry(R) |
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| 1951 | William H. Nicholas(R) | M. L. Abrahamson(R) | 41R, 9D | 93R, 15D |
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| 1952 | Dwight D. Eisenhower/ Richard Nixon(R) Y |
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| 1953 | Leo Elthon(R)[d] | Leo Hoegh(R) | 46R, 4D | 105R, 3D |
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| 1954 |
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| 1955 | Leo Hoegh(R) | Dayton Countryman(R) | 44R, 6D | 90R, 18D | Thomas E. Martin(R) |
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| 1956 |
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| 1957 | Herschel C. Loveless(D) | William H. Nicholas(R) | Norman A. Erbe(R) | 40R, 10D | 71R, 37D | 7R, 1D |
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| 1958 |
|---|
| 1959 | Edward J. McManus(D) | 33R, 17D | 58R, 50D | 4D, 4R |
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| 1960 | 5R, 3D | Richard Nixon/ Henry Cabot Lodge Jr.(R) N |
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| 1961 | Norman A. Erbe(R) | W. L. Mooty(R) | Evan Hultman(R) | L. B. Liddy(R) | 35R, 15D | 78R, 30D | Jack Miller(R) | 6R, 2D |
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| 1962 |
|---|
| 1963 | Harold Hughes(D)[c] | 38R, 12D | 6R, 1D |
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| 1964 | Lyndon B. Johnson/ Hubert Humphrey(D) Y |
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| 1965 | Robert D. Fulton(D) | Gary L. Cameron(D) | Lawrence F. Scalise(D) | Lorne R. Worthington(D) | Paul Franzenburg(D) | Kenneth E. Owen(D) | 34D, 25R | 101D, 23R | 6D, 1R |
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| 1966 |
|---|
| 1967 | Melvin D. Synhorst(R)[n] | Richard C. Turner(R) | Lloyd R. Smith(R) | L. B. Liddy(R) | 32D, 29R | 89R, 35D | 5R, 2D |
|---|
| 1968 | Richard Nixon/ Spiro Agnew(R) Y |
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| 1969 | Robert D. Ray(R) | Roger Jepsen(R) | Maurice E. Baringer(R) | 44R, 17D | 86R, 38D | Harold Hughes(D) |
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| 1970 |
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| 1971 | 38R, 12D | 63R, 37D |
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| 1972 |
|---|
| 1973 | Arthur Neu(R) | Robert H. Lounsberry(R) | 28R, 22D | 57R, 43D | Dick Clark(D) | 3D, 3R |
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| 1974 |
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| 1975 | 26D, 24R | 61D, 39R | John Culver(D) | 5D, 1R |
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| 1976 | Gerald Ford/ Bob Dole(R) N |
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| 1977 | 59D, 41R | 4D, 2R |
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| 1978 |
|---|
| 1979 | Terry Branstad(R) | Tom Miller(D) | Richard D. Johnson(R) | 28R, 22D | 57R, 43D | Roger Jepsen(R) | 3D, 3R |
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| 1980 | Ronald Reagan/ George H. W. Bush(R) Y |
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| 1981 | Mary Jane Odell(R) | 29R, 21D | 58R, 42D | Chuck Grassley(R) |
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| 1982 |
|---|
| 1983 | Terry Branstad(R) | Robert T. Anderson(D) | Michael Fitzgerald(D) | 28D, 22R | 60D, 40R |
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| 1984 |
|---|
| 1985 | 29D, 21R | Tom Harkin(D) | 4R, 2D |
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| 1986 |
|---|
| 1987 | Jo Ann Zimmerman(D) | Elaine Baxter(D) | Dale M. Cochran(D) | 30D, 20R | 58D, 42R |
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| 1988 | Michael Dukakis/ Lloyd Bentsen(D) N |
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| 1989 | 61D, 39R |
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| 1990 |
|---|
| 1991 | Joy Corning(R) | Bonnie Campbell(D) | 28D, 22R | 53D, 47R |
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| 1992 | Bill Clinton/ Al Gore(D) Y |
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| 1993 | 26D, 24R | 51R, 49D | 4R, 1D |
|---|
| 1994 |
|---|
| 1995 | Paul Pate(R) | Tom Miller(D) | 27D, 23R | 64R, 36D | 5R |
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| 1996 |
|---|
| 1997 | 29R, 21D | 54R, 46D | 4R, 1D |
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| 1998 |
|---|
| 1999 | Tom Vilsack(D) | Sally Pederson(D) | Chet Culver(D) | Patty Judge(D) | 30R, 20D | 56R, 44D |
|---|
| 2000 | Al Gore/ Joe Lieberman(D) N |
|---|
| 2001 |
|---|
| 2002 |
|---|
| 2003 | David A. Vaudt(R) | 29R, 21D | 54R, 46D |
|---|
| 2004 | George W. Bush/ Dick Cheney(R) Y |
|---|
| 2005 | 25D, 25R | 51R, 49D |
|---|
| 2006 |
|---|
| 2007 | Chet Culver(D) | Patty Judge(D) | Michael Mauro(D) | Bill Northey(R)[o] | 30D, 20R | 54D, 46R | 3D, 2R |
|---|
| 2008 | Barack Obama/ Joe Biden(D) Y |
|---|
| 2009 | 32D, 18R | 57D, 43R |
|---|
| 2010 |
|---|
| 2011 | Terry Branstad(R)[p] | Kim Reynolds(R) | Matt Schultz(R) | 26D, 24R | 60R, 40D |
|---|
| 2012 |
|---|
| 2013 | 53R, 46D, 1 vac. | 2D, 2R |
|---|
| Mary Mosiman(R) |
| 2014 | 53R, 47D |
|---|
| 2015 | Paul Pate(R) | 57R, 43D | Joni Ernst(R) | 3R, 1D |
|---|
| 2016 | Donald Trump/ Mike Pence(R) Y |
|---|
| 2017 | 29R, 20D, 1I | 59R, 41D |
|---|
| Kim Reynolds(R)[d] | Adam Gregg(R) |
| 2018 | Mike Naig(R) |
|---|
| 2019 | Rob Sand(D) | 32R, 18D | 53R, 47D | 3D, 1R |
|---|
| 2020 | Donald Trump/ Mike Pence(R) N |
|---|
| 2021 | 59R, 41D | 3R, 1D |
|---|
| 2022 | 60R, 40D[q] |
|---|
| 2023 | Brenna Bird(R) | Roby Smith(R) | 33R, 17D[r] | 64R, 36D | 4R |
|---|
| 2024 | Donald Trump/ JD Vance(R) Y |
|---|
| 2025 | Chris Cournoyer(R) | 67R, 33D |
|---|