| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 5,411 | 12,846 | 18,455 | |
| 2020 | R | 5,970 | 13,307 | 19,513 | |
| 2016 | R | 5,692 | 12,556 | 18,628 | |
| 2012 | R | 6,466 | 11,798 | 18,581 | |
| 2008 | R | 6,122 | 12,215 | 18,624 | |
| 2004 | R | 6,554 | 11,006 | 17,841 | |
| 2000 | R | 7,399 | 8,983 | 16,887 | |
| 1996 | D | 9,603 | 6,642 | 18,023 | |
| 1992 | D | 9,095 | 7,227 | 18,753 | |
| 1988 | R | 8,369 | 9,374 | 18,094 | |
| 1984 | R | 7,680 | 11,185 | 18,988 | |
| 1980 | D | 10,413 | 8,681 | 19,472 | |
| 1976 | D | 10,000 | 5,677 | 16,073 | |
| 1972 | R | 2,947 | 8,162 | 12,196 | |
| 1968 | D | 3,021 | 1,695 | 15,718 | |
| 1964 | D | 7,438 | 4,825 | 12,263 | |
| 1960 | D | 5,678 | 1,847 | 11,400 | |
| 1956 | D | 4,658 | 3,081 | 8,047 | |
| 1952 | D | 7,420 | 2,432 | 9,852 | |
| 1948 | D | 3,267 | 371 | 7,801 | |
| 1944 | D | 4,810 | 406 | 5,216 | |
| 1940 | D | 6,062 | 314 | 6,376 | |
| 1936 | D | 5,667 | 350 | 6,017 | |
| 1932 | D | 3,997 | 283 | 4,281 | |
| 1928 | D | 2,020 | 1,528 | 3,548 | |
| 1924 | D | 1,278 | 179 | 1,646 | |
| 1920 | D | 1,094 | 165 | 1,259 | |
| 1916 | D | 1,094 | 66 | 1,174 | |
| 1912 | D | 491 | 18 | 591 | |
| 1908 | D | 550 | 49 | 601 | |
| 1904 | D | 367 | 36 | 404 | |
| 1900 | D | 449 | 54 | 503 | |
| 1896 | D | 1,168 | 48 | 1,228 | |
| 1892 | D | 399 | 143 | 542 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Washington Parish, anchored by Franklinton in Louisiana's Florida Parishes region, recorded a 40-point Republican presidential margin in 2024, consistent with the broader rural shift across the state's historically Democratic-leaning north and east.
The unraveling was not abrupt. The Democratic margin in Washington Parish peaked at ninety-one points in 1896; 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 nine points. By 2024, the margin had widened further.
The economic and demographic context is severe. Washington Parish's median household income of $45,380 is among the lowest of any county in the United States; 24% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of Gila County and Cook County.