| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 2,221 | 10,596 | 12,900 | |
| 2020 | R | 2,589 | 10,790 | 13,521 | |
| 2016 | R | 2,426 | 9,526 | 12,249 | |
| 2012 | R | 3,321 | 8,814 | 12,297 | |
| 2008 | R | 4,308 | 8,873 | 13,392 | |
| 2004 | R | 5,549 | 7,859 | 13,535 | |
| 2000 | R | 6,056 | 6,168 | 12,440 | |
| 1996 | D | 6,226 | 4,310 | 11,536 | |
| 1992 | D | 6,497 | 4,812 | 12,864 | |
| 1988 | R | 4,785 | 6,037 | 10,858 | |
| 1984 | R | 4,769 | 6,384 | 11,252 | |
| 1980 | D | 5,766 | 5,397 | 11,365 | |
| 1976 | D | 7,204 | 2,986 | 10,320 | |
| 1972 | R | 2,243 | 5,800 | 8,243 | |
| 1968 | R | 2,235 | 2,420 | 9,335 | |
| 1964 | D | 5,672 | 2,802 | 8,474 | |
| 1960 | D | 4,244 | 3,800 | 8,196 | |
| 1956 | D | 5,185 | 2,349 | 7,637 | |
| 1952 | D | 4,623 | 2,682 | 7,345 | |
| 1948 | D | 3,490 | 642 | 4,617 | |
| 1944 | D | 3,670 | 615 | 4,298 | |
| 1940 | D | 4,360 | 536 | 4,914 | |
| 1936 | D | 3,728 | 417 | 4,145 | |
| 1932 | D | 3,183 | 334 | 3,569 | |
| 1928 | D | 2,492 | 789 | 3,281 | |
| 1924 | D | 3,223 | 485 | 3,769 | |
| 1920 | D | 4,547 | 1,307 | 5,874 | |
| 1916 | D | 3,170 | 591 | 3,790 | |
| 1912 | D | 2,152 | 455 | 2,863 | |
| 1908 | D | 2,258 | 711 | 2,990 | |
| 1904 | D | 2,624 | 756 | 3,400 | |
| 1900 | D | 2,722 | 771 | 3,640 | |
| 1896 | D | 3,775 | 1,147 | 5,061 | |
| 1892 | D | 2,694 | 771 | 4,523 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Obion's flatlands and small-town economy have pushed its presidential margins steadily rightward over the past two decades, landing at R+64.9 in 2024 — among the wider gaps recorded in the state's western tier.
The unraveling was not abrupt. The Democratic margin in Obion County peaked at eighty points in 1936; it narrowed steadily over the late twentieth century. The 2000 election delivered the county to the Republican party for the first time in many years, by a margin of one points. By 2024, the margin had widened further.
The economic and demographic context is severe. Obion County's median household income of $54,613 is among the lowest of any county in the United States; 19% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of Morgan County and Crockett County.