| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 1,523 | 4,336 | 5,939 | |
| 2020 | R | 1,683 | 4,390 | 6,172 | |
| 2016 | R | 1,587 | 3,977 | 5,933 | |
| 2012 | R | 2,521 | 3,317 | 5,925 | |
| 2008 | R | 2,805 | 3,016 | 5,930 | |
| 2004 | R | 2,484 | 3,368 | 5,905 | |
| 2000 | R | 2,281 | 2,988 | 5,438 | |
| 1996 | D | 2,399 | 2,353 | 5,309 | |
| 1992 | R | 2,175 | 2,428 | 5,806 | |
| 1988 | D | 2,831 | 2,731 | 5,593 | |
| 1984 | R | 2,539 | 3,362 | 5,938 | |
| 1980 | R | 1,918 | 3,681 | 6,092 | |
| 1976 | R | 2,975 | 3,127 | 6,187 | |
| 1972 | R | 2,349 | 3,706 | 6,129 | |
| 1968 | R | 2,131 | 3,544 | 5,949 | |
| 1964 | D | 3,857 | 2,269 | 6,133 | |
| 1960 | R | 2,757 | 4,179 | 6,937 | |
| 1956 | R | 2,803 | 4,305 | 7,114 | |
| 1952 | R | 2,053 | 5,115 | 7,178 | |
| 1948 | D | 3,096 | 2,802 | 6,051 | |
| 1944 | R | 2,855 | 3,114 | 6,003 | |
| 1940 | R | 3,514 | 3,632 | 7,173 | |
| 1936 | D | 3,930 | 2,585 | 6,629 | |
| 1932 | D | 3,822 | 2,355 | 6,254 | |
| 1928 | R | 1,933 | 3,114 | 5,095 | |
| 1924 | R | 550 | 3,183 | 5,339 | |
| 1920 | R | 725 | 3,617 | 4,474 | |
| 1916 | R | 913 | 1,726 | 2,679 | |
| 1912 | R | 710 | 860 | 2,507 | |
| 1908 | R | 804 | 1,750 | 2,606 | |
| 1904 | R | 517 | 2,112 | 2,694 | |
| 1900 | R | 827 | 2,186 | 3,065 | |
| 1896 | R | 1,007 | 1,975 | 3,009 | |
| 1892 | R | 789 | 1,214 | 2,075 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Hancock County's R+47.4 margin in 2024 places it among Iowa's most one-sided presidential counties, reflecting the broader rural consolidation that has reshaped the state's electoral map over the past decade.
The Republican margin in Hancock County reached its widest at sixty-five points in 1920. The margin in 2024 was forty-seven points, in line with the county's deep historical pattern.
Hancock County's loyalty is rooted in its place. Median household income of $70,601, a 93% non-Hispanic-white share, and a population of 10,671 together describe a community whose political habits are deeply settled. The county's voting pattern over the last decade is most similar to that of Sac County and Franklin County.
