Biggest governor landslides in Iowa

The most lopsided races for governor of Iowa, ranked by the winner’s margin over the runner-up.

The biggest landslide in a Iowa governor’s race was in 1924, a margin of 45.4 points. John Hammill beat James C. Murtagh, 604,624 to 226,850. Next widest are 1926 (43.0 points) and 1922 (41.1 points).

Every state is ranked together on Biggest governor landslides. For every gubernatorial race Iowa has held, special elections included, see the Iowa governor hub.

What is the biggest landslide in a Iowa governor’s race?

The widest margin in a Iowa gubernatorial general election came in 1924, 45.4 points. John Hammill beat James C. Murtagh, 604,624 to 226,850. Next are 1926 (43.0 points) and 1922 (41.1 points).

Why do some huge wins not appear?

A blowout only counts here when somebody real finished second, which means at least 5% of the vote. Without that rule the list fills with uncontested races and with contests where the record is simply missing the major opponent, both of which show the winner near 100%.

Does this include recalls and special elections?

No, only regular general elections for governor. The Iowa governor hub lists every race including specials and recalls.

Biggest governor landslides in Iowa
#ElectionResultVotesMargin
11924John Hammill R def. James C. Murtagh D604,624 – 226,850+45.4 points
21926John Hammill R def. Alex R. Miller D377,443 – 150,415+43.0 points
31922Nathan E. Kendall R def. J.R. Files D419,648 – 175,252+41.1 points
41964Harold Hughes D def. Evan Hultman R794,610 – 365,131+36.8 points
51930Dan W. Turner R def. Fred P. Hagemann D364,036 – 186,039+32.1 points
61869Samuel Merrill R def. George Gillespie D97,243 – 57,287+25.9 points
71942Bourke B. Hickenlooper R def. Nelson G. Kraschel D438,547 – 258,310+25.8 points
81928John Hammill R def. L. W. Housel D591,720 – 350,722+25.6 points
91881Buren R. Sherman R def. La Vega G. Kinne D133,328 – 73,344+25.5 points
101879John H. Gear R def. Henry Hoffman Trimble D157,408 – 85,364+24.7 points
111916William L. Harding R def. Edwin T. Meredith D313,586 – 186,832+24.7 points
121871Cyrus C. Carpenter R def. J. C. Knapp D109,328 – 68,199+23.1 points
132014Terry Branstad R def. Jack Hatch D666,032 – 420,787+21.7 points
141990Terry Branstad R def. Donald Avenson D591,852 – 379,372+21.7 points
151901Albert B. Cummins R def. T. J. Phillips D226,902 – 143,783+21.3 points
161863William M. Stone N def. James M Tuttle D86,118 – 56,169+21.0 points
171920Nathan E. Kendall R def. Clyde L. Herring D513,118 – 338,108+20.0 points
181903Albert B. Cummins R def. J. B. Sullivan D238,804 – 159,725+18.9 points
191950William S. Beardsley R def. Lester S. Gillette D506,642 – 347,176+18.6 points
202022Kim Reynolds R def. Deidre DeJear D709,198 – 482,950+18.5 points
211972Robert D. Ray R def. Paul Franzenburg D707,177 – 487,282+18.1 points
221867Samuel Merrill R def. Charles Mason D90,204 – 62,966+17.8 points
231978Robert D. Ray R def. Jerome D. Fitzgerald D491,713 – 345,519+17.3 points
241877John H. Gear R def. John P. Irish D121,316 – 79,304+17.1 points
251974Robert D. Ray R def. James Schaben D534,518 – 377,553+17.1 points

How this ranking is measured

Gubernatorial general elections in Iowa, ranked by the largest gap in vote share between the top two finishers, widest 25 shown. Served from the governor_race_margin materialized view. A qualifying race needs a genuine second-place finisher with at least 5% of the vote, and at least 1,000 votes between the top two. Recalls and special elections are excluded; the state hub lists those. The national list applies a 50,000-vote floor, so an early race can appear here and not there.

Compiled by PolitiFinder · published June 14, 2026 · sources: Data & sources · data last verified September 30, 2026.