| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 689 | 2,049 | 2,833 | |
| 2020 | R | 686 | 1,828 | 2,563 | |
| 2016 | R | 519 | 1,330 | 2,012 | |
| 2012 | R | 700 | 1,216 | 2,021 | |
| 2008 | R | 845 | 1,053 | 1,995 | |
| 2004 | R | 542 | 1,242 | 1,837 | |
| 2000 | R | 382 | 1,078 | 1,639 | |
| 1996 | D | 658 | 549 | 1,615 | |
| 1992 | D | 664 | 403 | 1,635 | |
| 1988 | D | 789 | 616 | 1,428 | |
| 1984 | R | 718 | 943 | 1,704 | |
| 1980 | R | 660 | 800 | 1,657 | |
| 1976 | D | 819 | 679 | 1,514 | |
| 1972 | R | 659 | 706 | 1,419 | |
| 1968 | D | 576 | 483 | 1,169 | |
| 1964 | D | 901 | 368 | 1,274 | |
| 1960 | D | 686 | 549 | 1,240 | |
| 1956 | R | 552 | 606 | 1,158 | |
| 1952 | R | 491 | 553 | 1,054 | |
| 1948 | D | 475 | 338 | 860 | |
| 1944 | D | 401 | 380 | 792 | |
| 1940 | D | 645 | 402 | 1,068 | |
| 1936 | D | 657 | 215 | 960 | |
| 1932 | D | 578 | 260 | 955 | |
| 1928 | R | 370 | 443 | 832 | |
| 1924 | R | 123 | 223 | 1,032 | |
| 1920 | D | 362 | 347 | 889 | |
| 1916 | D | 781 | 251 | 1,226 | |
| 1912 | — | — | — | — | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Mineral County stretches along the Clark Fork River through the Bitterroot Range, with a small, largely rural population that has delivered lopsided Republican margins in every recent presidential cycle by wide double digits.
The unraveling was not abrupt. The Democratic margin in Mineral County peaked at forty-six points in 1936; 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 forty-two points. By 2024, the margin had widened further.
The economic and demographic context is severe. Mineral County's median household income of $63,450 is among the lowest of any county in the United States; 14% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of Asotin County and Nez Perce County.