| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 1,002 | 3,104 | 4,158 | |
| 2020 | R | 1,078 | 2,975 | 4,088 | |
| 2016 | R | 1,056 | 2,638 | 3,907 | |
| 2012 | R | 1,731 | 2,026 | 3,830 | |
| 2008 | R | 1,798 | 2,000 | 3,873 | |
| 2004 | R | 1,855 | 2,067 | 3,963 | |
| 2000 | R | 1,699 | 1,858 | 3,647 | |
| 1996 | D | 1,884 | 1,272 | 3,513 | |
| 1992 | D | 1,829 | 1,323 | 3,782 | |
| 1988 | D | 2,338 | 1,313 | 3,667 | |
| 1984 | D | 2,342 | 1,927 | 4,291 | |
| 1980 | R | 1,866 | 2,003 | 4,117 | |
| 1976 | D | 2,360 | 1,581 | 3,996 | |
| 1972 | R | 1,736 | 2,357 | 4,155 | |
| 1968 | D | 2,240 | 2,143 | 4,705 | |
| 1964 | D | 3,186 | 1,588 | 4,791 | |
| 1960 | R | 2,459 | 2,922 | 5,391 | |
| 1956 | R | 2,616 | 2,984 | 5,612 | |
| 1952 | R | 2,785 | 3,219 | 6,042 | |
| 1948 | D | 3,445 | 2,371 | 5,926 | |
| 1944 | D | 3,258 | 2,625 | 5,929 | |
| 1940 | D | 3,994 | 3,270 | 7,336 | |
| 1936 | D | 4,205 | 3,001 | 7,461 | |
| 1932 | D | 3,716 | 2,458 | 6,426 | |
| 1928 | R | 2,819 | 4,060 | 6,981 | |
| 1924 | R | 1,388 | 4,098 | 8,048 | |
| 1920 | R | 2,081 | 4,500 | 7,352 | |
| 1916 | R | 2,095 | 2,144 | 4,749 | |
| 1912 | D | 1,485 | 1,385 | 5,282 | |
| 1908 | R | 1,979 | 2,686 | 5,207 | |
| 1904 | R | 1,182 | 3,249 | 5,226 | |
| 1900 | R | 1,705 | 2,233 | 4,326 | |
| 1896 | D | 2,086 | 1,836 | 4,018 | |
| 1892 | R | 1,169 | 1,501 | 3,300 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Monroe County's R+50.5 margin in 2024 reflects a broader rural Iowa realignment that has compressed Democratic support to trace levels in small, agriculture-dependent communities over the past decade.
The Republican margin in Monroe County reached its widest at fifty-one points in 2024. The margin in 2024 was fifty-one points, in line with the county's deep historical pattern.
Monroe County's loyalty is rooted in its place. Median household income of $70,996, a 95% non-Hispanic-white share, and a population of 7,513 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 Ringgold County and Decatur County.
