| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 1,919 | 4,234 | 6,239 | |
| 2020 | R | 2,233 | 4,308 | 6,631 | |
| 2016 | R | 2,266 | 3,742 | 6,518 | |
| 2012 | D | 3,554 | 2,836 | 6,484 | |
| 2008 | D | 3,923 | 2,557 | 6,583 | |
| 2004 | D | 3,708 | 3,040 | 6,806 | |
| 2000 | D | 3,435 | 2,936 | 6,584 | |
| 1996 | D | 3,355 | 2,191 | 6,360 | |
| 1992 | D | 2,913 | 2,129 | 6,640 | |
| 1988 | D | 3,530 | 2,549 | 6,136 | |
| 1984 | R | 3,186 | 3,661 | 6,917 | |
| 1980 | R | 2,935 | 3,929 | 7,433 | |
| 1976 | D | 3,503 | 3,432 | 6,988 | |
| 1972 | R | 3,134 | 3,836 | 7,030 | |
| 1968 | R | 2,966 | 3,510 | 6,764 | |
| 1964 | D | 4,545 | 2,632 | 7,182 | |
| 1960 | D | 4,063 | 3,822 | 7,889 | |
| 1956 | R | 3,275 | 4,205 | 7,495 | |
| 1952 | R | 2,921 | 5,022 | 7,949 | |
| 1948 | D | 4,071 | 3,449 | 7,589 | |
| 1944 | R | 3,328 | 3,575 | 6,929 | |
| 1940 | R | 3,981 | 4,440 | 8,423 | |
| 1936 | D | 4,458 | 3,143 | 7,866 | |
| 1932 | D | 5,047 | 2,585 | 7,676 | |
| 1928 | R | 3,665 | 3,712 | 7,394 | |
| 1924 | R | 1,736 | 3,416 | 7,347 | |
| 1920 | R | 2,171 | 4,517 | 6,744 | |
| 1916 | R | 1,697 | 1,999 | 3,729 | |
| 1912 | D | 1,891 | 1,022 | 3,631 | |
| 1908 | D | 1,877 | 1,571 | 3,501 | |
| 1904 | R | 1,790 | 1,972 | 3,811 | |
| 1900 | R | 2,063 | 2,085 | 4,194 | |
| 1896 | D | 2,084 | 1,967 | 4,081 | |
| 1892 | D | 1,878 | 1,516 | 3,449 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Chickasaw County's population hovers near 13,000, concentrated in small agricultural towns like New Hampton. Its presidential margins have shifted decisively rightward over the past four election cycles, tracking a broader rural Iowa trend away from competitive outcomes.
The Republican margin in Chickasaw County reached its widest at thirty-seven points in 2024. The margin in 2024 was thirty-seven points, in line with the county's deep historical pattern.
Chickasaw County's loyalty is rooted in its place. Median household income of $75,675, a 95% non-Hispanic-white share, and a population of 11,807 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 Henderson County and Ashtabula County.