| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 214 | 1,156 | 1,376 | |
| 2020 | R | 265 | 1,180 | 1,457 | |
| 2016 | R | 247 | 1,078 | 1,367 | |
| 2012 | R | 332 | 1,160 | 1,510 | |
| 2008 | R | 367 | 986 | 1,368 | |
| 2004 | R | 464 | 1,081 | 1,552 | |
| 2000 | R | 617 | 947 | 1,576 | |
| 1996 | D | 785 | 599 | 1,537 | |
| 1992 | D | 854 | 521 | 1,815 | |
| 1988 | D | 1,013 | 765 | 1,782 | |
| 1984 | R | 921 | 1,027 | 1,952 | |
| 1980 | D | 1,163 | 783 | 1,968 | |
| 1976 | D | 1,498 | 551 | 2,060 | |
| 1972 | R | 638 | 1,148 | 1,800 | |
| 1968 | D | 1,222 | 580 | 2,127 | |
| 1964 | D | 1,773 | 439 | 2,216 | |
| 1960 | D | 1,365 | 729 | 2,098 | |
| 1956 | D | 1,262 | 835 | 2,100 | |
| 1952 | D | 1,556 | 1,033 | 2,590 | |
| 1948 | D | 1,792 | 157 | 2,008 | |
| 1944 | D | 1,785 | 156 | 2,142 | |
| 1940 | D | 1,699 | 253 | 1,952 | |
| 1936 | D | 1,823 | 171 | 2,000 | |
| 1932 | D | 1,600 | 102 | 1,706 | |
| 1928 | R | 784 | 992 | 1,781 | |
| 1924 | D | 1,399 | 455 | 1,935 | |
| 1920 | D | 773 | 159 | 1,030 | |
| 1916 | D | 884 | 64 | 1,055 | |
| 1912 | D | 643 | 32 | 856 | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Knox County's sparse population — anchored by the small city of Benjamin — delivered a 68.5-point Republican margin in 2024, typical of the deeply conservative rural ranching counties stretching across the Rolling Plains of northwest Texas.
The unraveling was not abrupt. The Democratic margin in Knox County peaked at eighty-eight 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 twenty-one points. By 2024, the margin had widened further.
The economic and demographic context is severe. Knox County's median household income of $56,667 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 Hardeman County and Kent County.