| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | D | 9,735 | 4,649 | 14,540 | |
| 2020 | D | 12,503 | 5,300 | 18,034 | |
| 2016 | D | 11,380 | 5,244 | 16,825 | |
| 2012 | D | 13,981 | 5,651 | 19,715 | |
| 2008 | D | 13,148 | 6,347 | 19,583 | |
| 2004 | D | 11,569 | 7,731 | 19,597 | |
| 2000 | D | 10,405 | 7,367 | 18,328 | |
| 1996 | D | 10,053 | 6,762 | 17,440 | |
| 1992 | D | 10,588 | 7,598 | 19,689 | |
| 1988 | R | 10,222 | 10,229 | 20,687 | |
| 1984 | R | 10,617 | 12,454 | 23,414 | |
| 1980 | D | 10,722 | 8,978 | 20,117 | |
| 1976 | D | 9,650 | 7,474 | 18,149 | |
| 1972 | R | 4,623 | 9,634 | 15,104 | |
| 1968 | D | 5,520 | 3,500 | 15,320 | |
| 1964 | R | 2,004 | 5,611 | 7,615 | |
| 1960 | D | 3,105 | 2,292 | 6,655 | |
| 1956 | D | 2,722 | 1,973 | 5,490 | |
| 1952 | R | 2,618 | 3,301 | 5,919 | |
| 1948 | R | 260 | 271 | 2,979 | |
| 1944 | D | 2,012 | 454 | 2,466 | |
| 1940 | D | 2,349 | 292 | 2,642 | |
| 1936 | D | 2,143 | 94 | 2,241 | |
| 1932 | D | 1,691 | 100 | 1,795 | |
| 1928 | D | 1,496 | 246 | 1,742 | |
| 1924 | D | 1,277 | 143 | 1,422 | |
| 1920 | D | 776 | 60 | 837 | |
| 1916 | D | 836 | 47 | 886 | |
| 1912 | D | 731 | 20 | 827 | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | D | 580 | 122 | 702 | |
| 1896 | D | 611 | 98 | 758 | |
| 1892 | D | 600 | 20 | 632 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Washington County's electorate is majority-Black, a demographic legacy of the Delta's plantation-era settlement patterns, and it has returned Democratic presidential margins above 30 points in every recent cycle.
The unraveling was not abrupt. The Democratic margin in Washington County peaked at ninety-two points in 1892; it narrowed steadily over the late twentieth century. The 1992 election delivered the county to the Republican party for the first time in many years, by a margin of fifteen points. By 2024, the margin had settled into deep Republican territory.
The economic and demographic context is severe. Washington County's median household income of $42,165 is among the lowest of any county in the United States; 26% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of Shelby County and Leflore County.
