| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 628 | 2,679 | 3,333 | |
| 2020 | R | 678 | 2,672 | 3,394 | |
| 2016 | R | 724 | 2,458 | 3,316 | |
| 2012 | R | 1,398 | 1,730 | 3,225 | |
| 2008 | R | 1,572 | 1,782 | 3,456 | |
| 2004 | R | 1,794 | 1,899 | 3,736 | |
| 2000 | R | 1,812 | 1,899 | 3,802 | |
| 1996 | D | 1,749 | 1,081 | 3,313 | |
| 1992 | D | 1,815 | 1,039 | 3,584 | |
| 1988 | D | 1,925 | 1,493 | 3,431 | |
| 1984 | R | 1,627 | 2,068 | 3,695 | |
| 1980 | R | 1,494 | 2,042 | 3,614 | |
| 1976 | D | 1,679 | 1,582 | 3,274 | |
| 1972 | R | 1,403 | 2,499 | 3,902 | |
| 1968 | R | 1,489 | 2,111 | 3,942 | |
| 1964 | D | 2,223 | 1,660 | 3,883 | |
| 1960 | R | 2,039 | 2,642 | 4,681 | |
| 1956 | R | 2,193 | 2,623 | 4,816 | |
| 1952 | R | 2,045 | 2,850 | 4,918 | |
| 1948 | D | 2,352 | 2,264 | 4,619 | |
| 1944 | R | 2,155 | 2,707 | 4,868 | |
| 1940 | R | 2,728 | 3,171 | 5,917 | |
| 1936 | D | 3,003 | 2,812 | 5,840 | |
| 1932 | D | 3,072 | 2,223 | 5,324 | |
| 1928 | R | 2,170 | 3,259 | 5,447 | |
| 1924 | R | 2,770 | 2,948 | 5,853 | |
| 1920 | R | 2,383 | 3,310 | 5,761 | |
| 1916 | R | 1,692 | 1,782 | 3,516 | |
| 1912 | D | 1,586 | 1,214 | 3,323 | |
| 1908 | R | 1,737 | 1,741 | 3,516 | |
| 1904 | R | 1,724 | 1,836 | 3,636 | |
| 1900 | D | 2,021 | 1,899 | 3,981 | |
| 1896 | D | 2,107 | 1,953 | 4,078 | |
| 1892 | D | 1,807 | 1,684 | 3,547 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Clark County, tucked into Missouri's northeast corner along the Iowa border, has shifted decisively rightward over two decades; its 2024 presidential margin of R+61.5 reflects a pattern common to sparsely populated agricultural counties across the upper Midwest.
The Democratic margin in Clark County peaked at twenty-two points in 1992. By 2000 the county had flipped, voting Republican for the first time in many years. The 2024 margin was sixty-two points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Clark County's median household income of $51,781 sits well below state and national norms, and 11% 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 Harrison County and Iron County.