| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 3,647 | 13,192 | 17,050 | |
| 2020 | R | 3,924 | 11,850 | 16,009 | |
| 2016 | R | 3,535 | 9,540 | 13,612 | |
| 2012 | R | 4,752 | 8,010 | 13,015 | |
| 2008 | R | 5,515 | 8,562 | 14,400 | |
| 2004 | R | 6,808 | 7,503 | 14,400 | |
| 2000 | D | 7,378 | 5,552 | 13,131 | |
| 1996 | D | 6,389 | 4,226 | 11,633 | |
| 1992 | D | 7,189 | 3,704 | 12,355 | |
| 1988 | D | 4,646 | 4,529 | 9,218 | |
| 1984 | D | 4,813 | 4,811 | 9,691 | |
| 1980 | D | 6,021 | 3,680 | 9,904 | |
| 1976 | D | 6,666 | 2,364 | 9,115 | |
| 1972 | R | 2,118 | 3,565 | 5,894 | |
| 1968 | D | 2,046 | 1,858 | 7,718 | |
| 1964 | D | 5,027 | 1,754 | 6,781 | |
| 1960 | D | 3,119 | 2,682 | 5,841 | |
| 1956 | D | 4,014 | 1,954 | 5,998 | |
| 1952 | D | 3,568 | 1,912 | 5,513 | |
| 1948 | D | 2,969 | 807 | 4,464 | |
| 1944 | D | 2,560 | 848 | 3,429 | |
| 1940 | D | 2,323 | 546 | 2,887 | |
| 1936 | D | 2,304 | 553 | 2,870 | |
| 1932 | D | 2,325 | 410 | 2,765 | |
| 1928 | D | 1,111 | 923 | 2,043 | |
| 1924 | D | 1,356 | 490 | 1,874 | |
| 1920 | D | 1,986 | 1,010 | 3,012 | |
| 1916 | D | 1,855 | 624 | 2,498 | |
| 1912 | D | 1,745 | 339 | 2,350 | |
| 1908 | D | 1,573 | 729 | 2,330 | |
| 1904 | D | 1,815 | 707 | 2,599 | |
| 1900 | D | 1,926 | 672 | 2,598 | |
| 1896 | D | 2,101 | 842 | 3,003 | |
| 1892 | D | 1,568 | 633 | 2,614 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Warren County sits on Tennessee's Cumberland Plateau and has shifted steadily toward lopsided Republican margins in federal races, with Donald Trump carrying it by 56 points in 2024 — among the wider gaps in a state already dominated by one party at the top of the ticket.
The unraveling was not abrupt. The Democratic margin in Warren County peaked at sixty-nine points in 1932; it narrowed steadily over the late twentieth century. The 2004 election delivered the county to the Republican party for the first time in many years, by a margin of five points. By 2024, the margin had widened further.
The economic and demographic context is severe. Warren County's median household income of $55,487 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 Cannon County and Giles County.