| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 1,951 | 5,951 | 8,044 | |
| 2020 | R | 2,150 | 6,011 | 8,337 | |
| 2016 | R | 2,071 | 5,613 | 8,037 | |
| 2012 | R | 2,600 | 4,856 | 7,456 | |
| 2008 | R | 2,977 | 5,600 | 8,577 | |
| 2004 | R | 3,648 | 5,624 | 9,272 | |
| 2000 | R | 3,783 | 4,011 | 7,866 | |
| 1996 | D | 4,225 | 2,935 | 8,229 | |
| 1992 | D | 4,624 | 3,253 | 10,240 | |
| 1988 | D | 4,911 | 4,078 | 9,073 | |
| 1984 | R | 3,957 | 6,009 | 10,030 | |
| 1980 | R | 4,726 | 5,067 | 10,145 | |
| 1976 | D | 5,874 | 4,237 | 10,202 | |
| 1972 | R | 2,746 | 6,879 | 9,824 | |
| 1968 | D | 3,889 | 3,711 | 9,742 | |
| 1964 | D | 6,582 | 3,676 | 10,258 | |
| 1960 | R | 4,256 | 5,505 | 9,761 | |
| 1956 | D | 5,897 | 5,230 | 11,127 | |
| 1952 | D | 7,076 | 6,668 | 13,744 | |
| 1948 | D | 8,122 | 3,423 | 11,545 | |
| 1944 | D | 7,116 | 4,560 | 11,692 | |
| 1940 | D | 11,167 | 6,880 | 18,083 | |
| 1936 | D | 11,695 | 4,001 | 15,768 | |
| 1932 | D | 12,154 | 3,348 | 15,502 | |
| 1928 | R | 4,423 | 8,072 | 12,495 | |
| 1924 | D | 3,007 | 2,326 | 5,808 | |
| 1920 | R | 1,869 | 3,382 | 5,569 | |
| 1916 | D | 1,444 | 872 | 3,251 | |
| 1912 | D | 1,172 | 715 | 2,645 | |
| 1908 | R | 945 | 1,168 | 2,569 | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Seminole County, home to the Seminole Nation of Oklahoma, delivered an R+49.7 margin in the 2024 presidential race despite a Native American population that has historically produced more competitive local results.
The unraveling was not abrupt. The Democratic margin in Seminole County peaked at fifty-seven 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. Seminole County's median household income of $48,062 is among the lowest of any county in the United States; 22% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of Murray County and Caddo County.