| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 2,347 | 6,393 | 8,867 | |
| 2020 | R | 2,249 | 6,272 | 8,693 | |
| 2016 | R | 1,932 | 5,624 | 7,986 | |
| 2012 | R | 2,474 | 4,887 | 7,511 | |
| 2008 | R | 2,996 | 4,902 | 8,026 | |
| 2004 | R | 2,400 | 5,058 | 7,508 | |
| 2000 | R | 2,567 | 4,072 | 6,790 | |
| 1996 | R | 2,753 | 2,900 | 6,629 | |
| 1992 | R | 2,709 | 2,867 | 7,339 | |
| 1988 | R | 2,510 | 3,737 | 6,266 | |
| 1984 | R | 2,219 | 4,603 | 6,822 | |
| 1980 | R | 2,687 | 3,996 | 6,849 | |
| 1976 | R | 3,087 | 3,694 | 6,809 | |
| 1972 | R | 2,332 | 5,172 | 7,504 | |
| 1968 | R | 2,798 | 4,115 | 7,443 | |
| 1964 | D | 4,201 | 3,530 | 7,731 | |
| 1960 | R | 3,858 | 4,672 | 8,530 | |
| 1956 | R | 3,511 | 4,995 | 8,506 | |
| 1952 | R | 3,475 | 5,208 | 8,695 | |
| 1948 | R | 3,865 | 4,094 | 7,968 | |
| 1944 | R | 3,729 | 4,928 | 8,677 | |
| 1940 | R | 4,606 | 5,720 | 10,343 | |
| 1936 | D | 5,188 | 4,980 | 10,197 | |
| 1932 | D | 5,493 | 3,695 | 9,226 | |
| 1928 | R | 4,413 | 4,794 | 9,216 | |
| 1924 | R | 4,070 | 4,755 | 9,012 | |
| 1920 | R | 3,657 | 5,151 | 8,856 | |
| 1916 | R | 2,537 | 2,830 | 5,414 | |
| 1912 | D | 2,444 | 2,270 | 5,062 | |
| 1908 | R | 2,555 | 2,679 | 5,281 | |
| 1904 | R | 2,485 | 2,767 | 5,323 | |
| 1900 | D | 2,756 | 2,738 | 5,592 | |
| 1896 | D | 3,028 | 2,711 | 5,761 | |
| 1892 | D | 2,484 | 2,222 | 4,910 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Cooper County's R+45.8 margin in 2024 places it among Missouri's most heavily one-sided rural counties, reflecting a demographic profile dominated by small agricultural communities with minimal urban population centers.
The Republican margin in Cooper County reached its widest at forty-six points in 2020. The margin in 2024 was forty-six points, in line with the county's deep historical pattern.
Cooper County's loyalty is rooted in its place. Median household income of $70,625, a 88% non-Hispanic-white share, and a population of 16,824 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 Hardy County and Bullitt County.
