| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 1,008 | 2,884 | 4,027 | |
| 2020 | R | 1,150 | 3,109 | 4,367 | |
| 2016 | R | 877 | 2,696 | 3,843 | |
| 2012 | R | 1,111 | 2,777 | 4,019 | |
| 2008 | R | 1,313 | 2,981 | 4,420 | |
| 2004 | R | 1,149 | 3,235 | 4,467 | |
| 2000 | R | 945 | 2,969 | 4,107 | |
| 1996 | R | 1,368 | 2,285 | 4,303 | |
| 1992 | R | 1,489 | 1,803 | 4,625 | |
| 1988 | R | 1,416 | 2,518 | 4,017 | |
| 1984 | R | 1,219 | 2,995 | 4,310 | |
| 1980 | R | 1,046 | 2,579 | 4,000 | |
| 1976 | R | 1,733 | 1,917 | 3,744 | |
| 1972 | R | 1,271 | 2,085 | 3,565 | |
| 1968 | R | 1,264 | 1,713 | 3,267 | |
| 1964 | D | 1,972 | 1,386 | 3,358 | |
| 1960 | R | 1,691 | 1,839 | 3,550 | |
| 1956 | R | 1,729 | 1,981 | 3,723 | |
| 1952 | R | 1,548 | 2,475 | 4,047 | |
| 1948 | D | 1,607 | 1,480 | 3,180 | |
| 1944 | D | 1,540 | 1,288 | 2,837 | |
| 1940 | D | 2,232 | 1,371 | 3,630 | |
| 1936 | D | 1,828 | 968 | 2,831 | |
| 1932 | D | 1,643 | 655 | 2,386 | |
| 1928 | R | 711 | 942 | 1,660 | |
| 1924 | R | 374 | 731 | 1,672 | |
| 1920 | R | 535 | 992 | 1,585 | |
| 1916 | D | 1,222 | 768 | 2,098 | |
| 1912 | D | 941 | 0 | 1,714 | |
| 1908 | R | 574 | 620 | 1,242 | |
| 1904 | R | 444 | 559 | 1,037 | |
| 1900 | D | 532 | 446 | 996 | |
| 1896 | D | 588 | 300 | 909 | |
| 1892 | D | 596 | 406 | 1,145 | |
| 1888 | D | 679 | 552 | 1,278 | |
| 1884 | D | 609 | 478 | 1,120 | |
| 1880 | D | 490 | 410 | 906 | |
| 1876 | D | 322 | 208 | 530 |
Modoc's high-desert ranching economy and sparse population of under 10,000 produced a 46-point Republican presidential margin in 2024—the widest of any county in a state that voted heavily Democratic statewide.
The Democratic margin in Modoc County peaked at fifty-five points in 1912. By 1968 the county had flipped, voting Republican for the first time in many years. The 2024 margin was forty-seven points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Modoc County's median household income of $59,455 sits well below state and national norms, and 18% 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 Custer County and Fremont County.
