| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 319 | 2,020 | 2,375 | |
| 2020 | R | 319 | 2,026 | 2,385 | |
| 2016 | R | 365 | 1,910 | 2,350 | |
| 2012 | R | 605 | 1,634 | 2,239 | |
| 2008 | R | 805 | 1,652 | 2,457 | |
| 2004 | R | 1,057 | 1,546 | 2,603 | |
| 2000 | R | 1,245 | 1,320 | 2,593 | |
| 1996 | D | 1,430 | 865 | 2,646 | |
| 1992 | D | 1,580 | 671 | 3,019 | |
| 1988 | D | 1,767 | 1,063 | 2,846 | |
| 1984 | R | 1,496 | 1,656 | 3,179 | |
| 1980 | D | 1,812 | 1,440 | 3,332 | |
| 1976 | D | 2,303 | 956 | 3,285 | |
| 1972 | R | 969 | 1,709 | 2,751 | |
| 1968 | D | 1,628 | 780 | 3,109 | |
| 1964 | D | 2,555 | 811 | 3,366 | |
| 1960 | D | 1,945 | 1,343 | 3,288 | |
| 1956 | D | 2,539 | 1,186 | 3,725 | |
| 1952 | D | 2,872 | 1,384 | 4,256 | |
| 1948 | D | 3,326 | 556 | 3,882 | |
| 1944 | D | 2,948 | 974 | 3,937 | |
| 1940 | D | 3,814 | 1,226 | 5,060 | |
| 1936 | D | 3,719 | 1,032 | 4,773 | |
| 1932 | D | 3,566 | 485 | 4,051 | |
| 1928 | R | 1,916 | 2,251 | 4,185 | |
| 1924 | D | 2,441 | 1,108 | 3,763 | |
| 1920 | D | 2,289 | 1,733 | 4,403 | |
| 1916 | D | 1,739 | 493 | 2,862 | |
| 1912 | D | 1,118 | 361 | 2,157 | |
| 1908 | D | 1,435 | 604 | 2,318 | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Jefferson County, a sparsely populated stretch of southern Oklahoma near the Texas border, recorded a 71.6-point Republican presidential margin in 2024, placing it among the state's most one-sided jurisdictions in recent cycles.
The unraveling was not abrupt. The Democratic margin in Jefferson County peaked at seventy-six 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 three points. By 2024, the margin had widened further.
The economic and demographic context is severe. Jefferson County's median household income of $48,668 is among the lowest of any county in the United States; 23% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of Hughes County and Ottawa County.