| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 141 | 800 | 949 | |
| 2020 | R | 172 | 942 | 1,124 | |
| 2016 | R | 167 | 709 | 904 | |
| 2012 | R | 158 | 676 | 843 | |
| 2008 | R | 197 | 795 | 994 | |
| 2004 | R | 184 | 956 | 1,143 | |
| 2000 | R | 282 | 959 | 1,255 | |
| 1996 | R | 407 | 645 | 1,168 | |
| 1992 | R | 337 | 651 | 1,250 | |
| 1988 | R | 418 | 935 | 1,355 | |
| 1984 | R | 243 | 1,079 | 1,324 | |
| 1980 | R | 414 | 917 | 1,351 | |
| 1976 | R | 563 | 666 | 1,234 | |
| 1972 | R | 244 | 703 | 955 | |
| 1968 | R | 370 | 454 | 1,112 | |
| 1964 | D | 614 | 406 | 1,022 | |
| 1960 | D | 621 | 489 | 1,131 | |
| 1956 | R | 384 | 669 | 1,054 | |
| 1952 | R | 460 | 533 | 994 | |
| 1948 | D | 444 | 112 | 579 | |
| 1944 | D | 426 | 53 | 520 | |
| 1940 | D | 520 | 88 | 609 | |
| 1936 | D | 477 | 66 | 543 | |
| 1932 | D | 681 | 124 | 808 | |
| 1928 | R | 229 | 387 | 616 | |
| 1924 | D | 111 | 31 | 144 | |
| 1920 | D | 49 | 0 | 49 | |
| 1916 | D | 59 | 2 | 62 | |
| 1912 | D | 34 | 0 | 34 | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Reagan County sits in the Permian Basin, where an economy built almost entirely on oil and ranching has long produced some of the widest Republican presidential margins in the state — 2024's R+69.4 was typical, not exceptional.
The unraveling was not abrupt. The Democratic margin in Reagan County peaked at 100 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 eight points. By 2024, the margin had widened further.
The economic and demographic context is severe. Reagan County's median household income of $57,813 is among the lowest of any county in the United States; 12% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of Crane County and Andrews County.