| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 33,850 | 64,763 | 99,818 | |
| 2020 | R | 27,565 | 56,717 | 85,688 | |
| 2016 | R | 16,253 | 44,941 | 64,110 | |
| 2012 | R | 13,881 | 39,574 | 54,254 | |
| 2008 | R | 15,333 | 38,078 | 53,853 | |
| 2004 | R | 11,640 | 34,602 | 46,444 | |
| 2000 | R | 10,629 | 26,091 | 37,307 | |
| 1996 | R | 10,832 | 16,046 | 29,766 | |
| 1992 | R | 9,537 | 13,564 | 33,495 | |
| 1988 | R | 11,169 | 16,422 | 27,749 | |
| 1984 | R | 8,029 | 16,873 | 24,974 | |
| 1980 | R | 9,219 | 10,046 | 19,580 | |
| 1976 | D | 9,991 | 6,996 | 17,055 | |
| 1972 | R | 3,839 | 8,779 | 12,626 | |
| 1968 | D | 5,431 | 3,794 | 12,067 | |
| 1964 | D | 7,278 | 2,779 | 10,062 | |
| 1960 | D | 5,841 | 3,666 | 9,543 | |
| 1956 | D | 5,211 | 3,585 | 8,820 | |
| 1952 | D | 6,275 | 4,183 | 10,482 | |
| 1948 | D | 5,792 | 1,055 | 7,665 | |
| 1944 | D | 7,065 | 666 | 8,304 | |
| 1940 | D | 7,881 | 692 | 8,578 | |
| 1936 | D | 5,644 | 319 | 5,975 | |
| 1932 | D | 7,033 | 527 | 7,604 | |
| 1928 | D | 4,399 | 3,569 | 7,981 | |
| 1924 | D | 6,220 | 4,078 | 11,330 | |
| 1920 | D | 4,081 | 819 | 5,857 | |
| 1916 | D | 4,718 | 324 | 5,127 | |
| 1912 | D | 3,483 | 293 | 4,075 | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Ellis County has absorbed rapid population growth from the Dallas–Fort Worth metroplex while maintaining lopsided Republican margins, with the 2024 presidential race decided by more than 31 points — a pattern that has held even as newcomers reshape its demographics.
The unraveling was not abrupt. The Democratic margin in Ellis County peaked at eighty-nine points in 1936; it narrowed steadily over the late twentieth century. The 1980 election delivered the county to the Republican party for the first time in many years, by a margin of four points. By 2024, the margin had settled into deep Republican territory.
The economic and demographic context is severe. Ellis County's median household income of $99,595 is among the lowest of any county in the United States; 7% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of Mesa County and Hall County.