| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 153 | 547 | 728 | |
| 2020 | R | 149 | 507 | 754 | |
| 2016 | R | 110 | 410 | 590 | |
| 2012 | R | 159 | 402 | 578 | |
| 2008 | R | 187 | 422 | 618 | |
| 2004 | R | 139 | 450 | 595 | |
| 2000 | R | 113 | 359 | 507 | |
| 1996 | R | 156 | 283 | 544 | |
| 1992 | R | 134 | 202 | 486 | |
| 1988 | R | 136 | 288 | 437 | |
| 1984 | R | 123 | 364 | 491 | |
| 1980 | R | 145 | 360 | 530 | |
| 1976 | R | 160 | 288 | 463 | |
| 1972 | R | 95 | 344 | 463 | |
| 1968 | R | 118 | 271 | 482 | |
| 1964 | R | 258 | 316 | 574 | |
| 1960 | D | 322 | 284 | 606 | |
| 1956 | R | 266 | 337 | 603 | |
| 1952 | R | 224 | 425 | 650 | |
| 1948 | R | 278 | 289 | 575 | |
| 1944 | D | 317 | 301 | 618 | |
| 1940 | D | 381 | 367 | 748 | |
| 1936 | D | 442 | 274 | 731 | |
| 1932 | D | 441 | 234 | 690 | |
| 1928 | R | 230 | 413 | 653 | |
| 1924 | R | 113 | 226 | 641 | |
| 1920 | R | 276 | 400 | 677 | |
| 1916 | — | — | — | — | |
| 1912 | — | — | — | — | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
With fewer than a thousand residents spread across high desert and rangeland, Camas County consistently produces some of Idaho's largest Republican presidential margins, reflecting the political uniformity common to the state's most rural, sparsely settled corners.
The Democratic margin in Camas County peaked at thirty points in 1932. By 1964 the county had flipped, voting Republican for the first time in many years. The 2024 margin was fifty-four points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Camas County's median household income of $57,955 sits well below state and national norms, and 6% of residents live below the federal poverty line. The shift here is part of a broader realignment of working-class places across the country. The county's voting pattern over the last decade is most similar to that of Twin Falls County and Elmore County.