| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 4,426 | 9,359 | 13,913 | |
| 2020 | R | 5,457 | 9,112 | 14,736 | |
| 2016 | R | 5,165 | 8,068 | 13,500 | |
| 2012 | R | 5,553 | 7,353 | 13,051 | |
| 2008 | R | 5,242 | 6,883 | 12,257 | |
| 2004 | R | 5,026 | 6,211 | 11,336 | |
| 2000 | R | 5,036 | 5,260 | 10,596 | |
| 1996 | D | 6,221 | 3,526 | 10,520 | |
| 1992 | D | 5,671 | 3,643 | 11,021 | |
| 1988 | D | 5,366 | 5,022 | 10,516 | |
| 1984 | R | 4,642 | 5,989 | 10,739 | |
| 1980 | D | 5,861 | 4,349 | 10,327 | |
| 1976 | D | 4,630 | 3,601 | 8,348 | |
| 1972 | R | 2,596 | 4,017 | 7,153 | |
| 1968 | D | 3,400 | 974 | 8,564 | |
| 1964 | D | 3,954 | 1,254 | 5,208 | |
| 1960 | R | 1,183 | 1,603 | 4,439 | |
| 1956 | R | 1,206 | 2,011 | 3,771 | |
| 1952 | R | 1,678 | 2,303 | 3,981 | |
| 1948 | D | 617 | 270 | 2,778 | |
| 1944 | D | 1,858 | 538 | 2,396 | |
| 1940 | D | 2,872 | 211 | 3,083 | |
| 1936 | D | 2,337 | 93 | 2,430 | |
| 1932 | D | 2,416 | 87 | 2,505 | |
| 1928 | D | 1,445 | 517 | 1,964 | |
| 1924 | D | 1,146 | 118 | 1,275 | |
| 1920 | D | 1,219 | 56 | 1,275 | |
| 1916 | D | 1,104 | 17 | 1,121 | |
| 1912 | D | 815 | 11 | 919 | |
| 1908 | D | 881 | 17 | 940 | |
| 1904 | D | 908 | 9 | 930 | |
| 1900 | D | 923 | 17 | 940 | |
| 1896 | D | 1,940 | 153 | 2,119 | |
| 1892 | D | 1,598 | 293 | 1,891 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
De Soto Parish sits in Louisiana's Ark-La-Tex corner, where an economy rooted in timber, oil, and agriculture correlates with some of the state's most lopsided presidential margins — Republicans carried it by roughly 35 points in 2024.
The Democratic margin in De Soto Parish peaked at ninety-seven points in 1916. By 2000 the county had flipped, voting Republican for the first time in many years. The 2024 margin was thirty-five points, the most Republican-leaning result in the county's modern history.
The economic context is the key. De Soto Parish's median household income of $48,578 sits well below state and national norms, and 22% of residents live below the federal poverty line. The shift here is part of a broader realignment of working-class places across the country. The county's voting pattern over the last decade is most similar to that of East Feliciana Parish and West Feliciana Parish.