| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 1,460 | 8,148 | 9,867 | |
| 2020 | R | 1,561 | 7,826 | 9,602 | |
| 2016 | R | 1,196 | 6,441 | 8,226 | |
| 2012 | R | 1,708 | 5,921 | 7,837 | |
| 2008 | R | 2,017 | 5,895 | 8,210 | |
| 2004 | R | 1,689 | 6,017 | 7,970 | |
| 2000 | R | 1,187 | 5,806 | 7,452 | |
| 1996 | R | 1,979 | 3,871 | 7,098 | |
| 1992 | R | 1,974 | 2,709 | 6,734 | |
| 1988 | R | 2,198 | 3,541 | 5,871 | |
| 1984 | R | 1,996 | 4,219 | 6,349 | |
| 1980 | R | 2,078 | 4,425 | 7,073 | |
| 1976 | R | 2,323 | 3,185 | 5,692 | |
| 1972 | R | 1,622 | 3,235 | 5,201 | |
| 1968 | R | 1,883 | 2,317 | 4,914 | |
| 1964 | D | 3,188 | 1,990 | 5,178 | |
| 1960 | D | 3,256 | 2,248 | 5,504 | |
| 1956 | R | 2,546 | 2,703 | 5,249 | |
| 1952 | R | 2,269 | 3,054 | 5,330 | |
| 1948 | D | 2,300 | 1,790 | 4,218 | |
| 1944 | D | 2,071 | 1,977 | 4,063 | |
| 1940 | D | 2,888 | 2,641 | 5,545 | |
| 1936 | D | 3,104 | 1,535 | 4,929 | |
| 1932 | D | 3,005 | 1,079 | 4,186 | |
| 1928 | R | 1,676 | 2,099 | 3,812 | |
| 1924 | R | 779 | 1,363 | 3,571 | |
| 1920 | R | 1,128 | 2,386 | 3,514 | |
| 1916 | D | 2,265 | 1,892 | 4,552 | |
| 1912 | D | 1,679 | 989 | 4,284 | |
| 1908 | R | 1,833 | 2,129 | 4,451 | |
| 1904 | R | 1,381 | 2,731 | 4,468 | |
| 1900 | D | 1,884 | 1,527 | 3,489 | |
| 1896 | D | 1,127 | 377 | 1,511 | |
| 1892 | R | 0 | 386 | 839 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Idaho County delivered an R+68 margin in 2024, reflecting the dominant pattern of rural, resource-economy counties across the Inland Northwest where Republican candidates routinely post some of the widest margins in the state.
The Republican margin in Idaho County reached its widest at sixty-eight points in 2024. The margin in 2024 was sixty-eight points, in line with the county's deep historical pattern.
Idaho County's loyalty is rooted in its place. Median household income of $66,325, a 91% non-Hispanic-white share, and a population of 17,432 together describe a community whose political habits are deeply settled. The county's voting pattern over the last decade is most similar to that of Golden Valley County and Harney County.
