| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 2,535 | 8,286 | 10,932 | |
| 2020 | R | 2,619 | 8,027 | 10,805 | |
| 2016 | R | 2,357 | 7,075 | 9,912 | |
| 2012 | R | 3,606 | 6,229 | 10,182 | |
| 2008 | R | 4,869 | 6,095 | 11,159 | |
| 2004 | R | 4,461 | 6,361 | 10,877 | |
| 2000 | R | 4,459 | 5,120 | 9,778 | |
| 1996 | D | 4,579 | 3,260 | 9,137 | |
| 1992 | D | 4,232 | 2,681 | 9,740 | |
| 1988 | R | 4,135 | 4,167 | 8,328 | |
| 1984 | R | 3,741 | 5,419 | 9,160 | |
| 1980 | R | 4,648 | 4,807 | 9,772 | |
| 1976 | D | 5,282 | 4,168 | 9,497 | |
| 1972 | R | 3,125 | 5,802 | 8,927 | |
| 1968 | R | 3,514 | 3,824 | 8,020 | |
| 1964 | D | 5,761 | 3,083 | 8,844 | |
| 1960 | R | 4,601 | 6,012 | 10,613 | |
| 1956 | R | 4,900 | 5,789 | 10,689 | |
| 1952 | R | 4,576 | 6,628 | 11,220 | |
| 1948 | D | 5,551 | 4,619 | 10,174 | |
| 1944 | R | 4,587 | 5,564 | 10,174 | |
| 1940 | R | 6,069 | 6,332 | 12,423 | |
| 1936 | D | 7,145 | 4,927 | 12,111 | |
| 1932 | D | 6,809 | 3,631 | 10,500 | |
| 1928 | R | 4,319 | 6,263 | 10,603 | |
| 1924 | D | 4,706 | 4,616 | 9,871 | |
| 1920 | D | 5,367 | 5,313 | 10,813 | |
| 1916 | D | 3,653 | 2,727 | 6,509 | |
| 1912 | D | 3,396 | 1,162 | 6,315 | |
| 1908 | D | 3,577 | 2,854 | 6,591 | |
| 1904 | D | 3,222 | 2,799 | 6,291 | |
| 1900 | D | 3,777 | 2,626 | 6,649 | |
| 1896 | D | 4,442 | 3,234 | 7,738 | |
| 1892 | D | 3,475 | 2,563 | 6,540 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Henry County, anchored by Clinton in west-central Missouri, has shifted decisively toward Republican presidential candidates over the past two decades, posting a 52-point margin in 2024 that reflects broader rural realignment across the state's agricultural interior.
The Democratic margin in Henry County peaked at thirty-five points in 1912. By 2000 the county had flipped, voting Republican for the first time in many years. The 2024 margin was fifty-three points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Henry County's median household income of $57,926 sits well below state and national norms, and 14% of residents live below the federal poverty line. The shift here is part of a broader realignment of working-class places across the country. The county's voting pattern over the last decade is most similar to that of Hamilton County and Linn County.