| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 1,086 | 2,916 | 4,080 | |
| 2020 | R | 1,198 | 2,917 | 4,177 | |
| 2016 | R | 1,133 | 2,461 | 3,848 | |
| 2012 | R | 1,790 | 2,114 | 3,996 | |
| 2008 | R | 1,924 | 2,060 | 4,053 | |
| 2004 | R | 1,844 | 2,402 | 4,278 | |
| 2000 | R | 1,753 | 2,275 | 4,123 | |
| 1996 | D | 1,802 | 1,655 | 3,935 | |
| 1992 | R | 1,655 | 1,713 | 4,194 | |
| 1988 | D | 2,261 | 1,833 | 4,123 | |
| 1984 | R | 1,979 | 2,615 | 4,619 | |
| 1980 | R | 1,454 | 2,821 | 4,689 | |
| 1976 | R | 2,294 | 2,326 | 4,722 | |
| 1972 | R | 1,642 | 3,041 | 4,782 | |
| 1968 | R | 1,559 | 2,789 | 4,586 | |
| 1964 | D | 2,851 | 1,953 | 4,812 | |
| 1960 | R | 2,245 | 3,383 | 5,630 | |
| 1956 | R | 2,362 | 3,426 | 5,791 | |
| 1952 | R | 1,817 | 4,497 | 6,326 | |
| 1948 | R | 2,567 | 2,879 | 5,523 | |
| 1944 | R | 2,297 | 3,428 | 5,743 | |
| 1940 | R | 2,734 | 3,907 | 6,648 | |
| 1936 | R | 3,243 | 3,436 | 6,763 | |
| 1932 | D | 2,607 | 2,305 | 4,949 | |
| 1928 | R | 1,854 | 4,176 | 6,057 | |
| 1924 | R | 688 | 4,043 | 6,008 | |
| 1920 | R | 1,358 | 4,133 | 5,563 | |
| 1916 | R | 1,619 | 1,922 | 3,568 | |
| 1912 | R | 1,195 | 1,248 | 3,402 | |
| 1908 | R | 1,322 | 2,185 | 3,579 | |
| 1904 | R | 895 | 2,303 | 3,376 | |
| 1900 | R | 1,618 | 2,327 | 4,022 | |
| 1896 | R | 1,946 | 2,127 | 4,111 | |
| 1892 | R | 1,264 | 1,836 | 3,359 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Adair County's small, aging farming population has shifted decisively toward Republican presidential candidates over the past decade, posting a margin exceeding 44 points in 2024 — among the widest in the state.
The Republican margin in Adair County reached its widest at fifty-six points in 1924. The margin in 2024 was forty-five points, in line with the county's deep historical pattern.
Adair County's loyalty is rooted in its place. Median household income of $68,092, a 94% non-Hispanic-white share, and a population of 7,460 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 Wright County and Calhoun County.
