| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 3,769 | 11,842 | 15,803 | |
| 2020 | R | 4,245 | 11,920 | 16,529 | |
| 2016 | R | 4,273 | 11,294 | 15,804 | |
| 2012 | R | 4,518 | 10,622 | 15,329 | |
| 2008 | R | 4,869 | 9,913 | 15,063 | |
| 2004 | R | 6,139 | 8,448 | 14,678 | |
| 2000 | R | 6,278 | 7,276 | 13,745 | |
| 1996 | D | 6,469 | 4,874 | 12,506 | |
| 1992 | D | 7,050 | 5,273 | 14,623 | |
| 1988 | R | 5,437 | 7,110 | 12,629 | |
| 1984 | R | 4,686 | 8,302 | 13,088 | |
| 1980 | R | 5,996 | 6,770 | 12,921 | |
| 1976 | D | 6,648 | 4,679 | 11,349 | |
| 1972 | R | 2,855 | 8,355 | 11,210 | |
| 1968 | D | 2,929 | 2,662 | 10,653 | |
| 1964 | D | 5,190 | 4,253 | 9,492 | |
| 1960 | D | 4,550 | 3,113 | 8,117 | |
| 1956 | D | 5,402 | 4,307 | 9,987 | |
| 1952 | D | 5,337 | 3,137 | 8,509 | |
| 1948 | D | 2,850 | 488 | 4,579 | |
| 1944 | D | 2,873 | 972 | 3,851 | |
| 1940 | D | 3,019 | 563 | 3,599 | |
| 1936 | D | 2,689 | 323 | 3,021 | |
| 1932 | D | 3,876 | 322 | 4,233 | |
| 1928 | D | 1,752 | 1,150 | 2,911 | |
| 1924 | D | 1,460 | 397 | 2,297 | |
| 1920 | D | 1,545 | 836 | 2,466 | |
| 1916 | D | 1,418 | 402 | 1,820 | |
| 1912 | D | 846 | 331 | 1,478 | |
| 1908 | D | 1,035 | 722 | 1,842 | |
| 1904 | D | 763 | 666 | 1,476 | |
| 1900 | D | 855 | 759 | 1,669 | |
| 1896 | D | 1,073 | 565 | 1,649 | |
| 1892 | D | 1,064 | 647 | 1,836 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Miller County sits on the Texas border anchored by Texarkana, a twin city straddling two states. Despite its urban core, it has shifted toward supermajority Republican margins over the past decade, reflecting broader rural realignment across southwest Arkansas.
The unraveling was not abrupt. The Democratic margin in Miller County peaked at eighty-four points in 1932; 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 seven points. By 2024, the margin had widened further.
The economic and demographic context is severe. Miller County's median household income of $48,836 is among the lowest of any county in the United States; 25% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of Franklin County and Stone County.