| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 105 | 761 | 868 | |
| 2020 | R | 120 | 763 | 894 | |
| 2016 | R | 90 | 660 | 766 | |
| 2012 | R | 112 | 668 | 788 | |
| 2008 | R | 164 | 644 | 817 | |
| 2004 | R | 141 | 684 | 828 | |
| 2000 | R | 162 | 624 | 793 | |
| 1996 | R | 213 | 386 | 690 | |
| 1992 | R | 256 | 283 | 831 | |
| 1988 | R | 326 | 539 | 867 | |
| 1984 | R | 199 | 619 | 822 | |
| 1980 | R | 239 | 427 | 670 | |
| 1976 | R | 297 | 302 | 604 | |
| 1972 | R | 111 | 363 | 477 | |
| 1968 | R | 187 | 211 | 490 | |
| 1964 | D | 351 | 199 | 550 | |
| 1960 | D | 246 | 238 | 487 | |
| 1956 | R | 178 | 252 | 432 | |
| 1952 | D | 282 | 268 | 550 | |
| 1948 | D | 366 | 63 | 440 | |
| 1944 | D | 363 | 54 | 453 | |
| 1940 | D | 560 | 74 | 637 | |
| 1936 | D | 476 | 49 | 530 | |
| 1932 | D | 398 | 47 | 456 | |
| 1928 | R | 119 | 259 | 378 | |
| 1924 | D | 205 | 73 | 288 | |
| 1920 | D | 148 | 45 | 224 | |
| 1916 | D | 150 | 5 | 166 | |
| 1912 | D | 132 | 0 | 147 | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Irion County sits in the Permian Basin with fewer than 1,800 residents, and its lopsided presidential margins reflect a ranching and energy-dependent economy typical of sparsely settled West Texas counties.
The unraveling was not abrupt. The Democratic margin in Irion County peaked at ninety points in 1912; it narrowed steadily over the late twentieth century. The 1968 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. Irion County's median household income of $70,357 is among the lowest of any county in the United States; 11% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of Llano County and Mason County.