| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 74 | 895 | 977 | |
| 2020 | R | 81 | 917 | 1,009 | |
| 2016 | R | 78 | 850 | 953 | |
| 2012 | R | 71 | 790 | 869 | |
| 2008 | R | 102 | 813 | 920 | |
| 2004 | R | 108 | 733 | 843 | |
| 2000 | R | 108 | 659 | 774 | |
| 1996 | R | 213 | 583 | 881 | |
| 1992 | R | 225 | 583 | 987 | |
| 1988 | R | 303 | 691 | 1,004 | |
| 1984 | R | 226 | 762 | 990 | |
| 1980 | R | 290 | 557 | 874 | |
| 1976 | D | 554 | 354 | 911 | |
| 1972 | R | 173 | 666 | 863 | |
| 1968 | R | 237 | 320 | 788 | |
| 1964 | D | 397 | 269 | 670 | |
| 1960 | D | 326 | 313 | 643 | |
| 1956 | D | 294 | 284 | 578 | |
| 1952 | R | 280 | 341 | 624 | |
| 1948 | D | 339 | 100 | 458 | |
| 1944 | D | 277 | 93 | 409 | |
| 1940 | D | 416 | 82 | 499 | |
| 1936 | D | 437 | 20 | 462 | |
| 1932 | D | 432 | 61 | 493 | |
| 1928 | R | 157 | 172 | 329 | |
| 1924 | D | 187 | 71 | 272 | |
| 1920 | D | 139 | 52 | 192 | |
| 1916 | D | 138 | 42 | 184 | |
| 1912 | D | 92 | 22 | 142 | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Oldham sits in the Texas Panhandle with roughly 2,000 residents spread across ranchland, and its 84-point Republican margin in 2024 places it among the most lopsided presidential results in the state.
The unraveling was not abrupt. The Democratic margin in Oldham County peaked at ninety 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 thirty-one points. By 2024, the margin had widened further.
The economic and demographic context is severe. Oldham County's median household income of $79,900 is among the lowest of any county in the United States; 21% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of Cimarron County and Hartley County.