| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 1,169 | 5,348 | 6,589 | |
| 2020 | R | 1,100 | 4,891 | 6,064 | |
| 2016 | R | 1,096 | 4,206 | 5,492 | |
| 2012 | R | 1,396 | 3,744 | 5,140 | |
| 2008 | R | 1,643 | 3,730 | 5,373 | |
| 2004 | R | 2,088 | 3,363 | 5,451 | |
| 2000 | R | 2,210 | 2,641 | 4,900 | |
| 1996 | D | 2,624 | 1,605 | 4,913 | |
| 1992 | D | 2,519 | 1,478 | 5,498 | |
| 1988 | D | 2,730 | 1,911 | 4,669 | |
| 1984 | R | 2,039 | 2,488 | 4,560 | |
| 1980 | D | 2,157 | 1,961 | 4,195 | |
| 1976 | D | 2,939 | 1,358 | 4,324 | |
| 1972 | R | 1,113 | 2,273 | 3,477 | |
| 1968 | R | 1,191 | 1,209 | 3,386 | |
| 1964 | D | 2,318 | 1,101 | 3,419 | |
| 1960 | D | 1,793 | 1,325 | 3,118 | |
| 1956 | D | 2,100 | 1,151 | 3,251 | |
| 1952 | D | 2,288 | 1,204 | 3,492 | |
| 1948 | D | 2,455 | 469 | 2,924 | |
| 1944 | D | 2,261 | 752 | 3,024 | |
| 1940 | D | 2,723 | 1,032 | 3,770 | |
| 1936 | D | 2,840 | 415 | 3,278 | |
| 1932 | D | 3,236 | 319 | 3,555 | |
| 1928 | D | 1,358 | 1,063 | 2,501 | |
| 1924 | D | 1,935 | 866 | 3,346 | |
| 1920 | D | 1,589 | 1,487 | 3,345 | |
| 1916 | D | 1,352 | 449 | 2,424 | |
| 1912 | D | 958 | 315 | 1,967 | |
| 1908 | D | 842 | 406 | 1,659 | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Marshall County sits along the Red River at Lake Texoma, where a small, rural population has delivered Republican presidential margins exceeding 60 points in recent cycles, making it among the most one-sided counties in the state.
The unraveling was not abrupt. The Democratic margin in Marshall County peaked at eighty-two 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 nine points. By 2024, the margin had widened further.
The economic and demographic context is severe. Marshall County's median household income of $57,245 is among the lowest of any county in the United States; 16% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of Bryan County and Johnston County.