| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 2,431 | 4,414 | 7,021 | |
| 2020 | R | 3,239 | 4,559 | 7,961 | |
| 2016 | R | 2,661 | 3,551 | 6,697 | |
| 2012 | R | 2,314 | 3,601 | 6,045 | |
| 2008 | R | 2,569 | 3,733 | 6,448 | |
| 2004 | R | 1,947 | 4,142 | 6,166 | |
| 2000 | R | 1,745 | 3,629 | 5,590 | |
| 1996 | R | 2,054 | 3,047 | 5,612 | |
| 1992 | R | 1,798 | 2,589 | 5,635 | |
| 1988 | R | 2,022 | 3,077 | 5,172 | |
| 1984 | R | 1,725 | 3,388 | 5,188 | |
| 1980 | R | 1,605 | 2,897 | 4,995 | |
| 1976 | R | 2,340 | 2,733 | 5,182 | |
| 1972 | R | 1,810 | 2,715 | 4,717 | |
| 1968 | R | 1,858 | 2,361 | 4,577 | |
| 1964 | D | 2,790 | 1,811 | 4,606 | |
| 1960 | R | 2,348 | 2,497 | 4,861 | |
| 1956 | R | 2,171 | 2,474 | 4,648 | |
| 1952 | R | 1,818 | 2,678 | 4,513 | |
| 1948 | D | 2,020 | 1,803 | 3,901 | |
| 1944 | D | 2,090 | 1,579 | 3,679 | |
| 1940 | D | 2,655 | 1,774 | 4,464 | |
| 1936 | D | 2,965 | 1,186 | 4,213 | |
| 1932 | D | 2,752 | 1,095 | 3,982 | |
| 1928 | R | 1,338 | 1,752 | 3,112 | |
| 1924 | R | 495 | 1,127 | 2,571 | |
| 1920 | R | 907 | 1,645 | 2,686 | |
| 1916 | D | 1,998 | 1,011 | 3,177 | |
| 1912 | D | 1,760 | 0 | 2,768 | |
| 1908 | D | 1,064 | 730 | 1,892 | |
| 1904 | D | 900 | 885 | 1,892 | |
| 1900 | D | 1,075 | 648 | 1,801 | |
| 1896 | D | 1,250 | 581 | 1,883 | |
| 1892 | D | 1,187 | 645 | 2,075 | |
| 1888 | D | 2,010 | 1,116 | 3,176 | |
| 1884 | D | 1,802 | 1,028 | 2,899 | |
| 1880 | D | 1,607 | 882 | 2,492 | |
| 1876 | D | 1,468 | 766 | 2,234 |
Colusa's economy revolves around rice, almonds, and cattle ranching, and its rural agricultural identity consistently produces some of the widest Republican presidential margins among California's Central Valley counties.
The Republican margin in Colusa County reached its widest at thirty-six points in 2004. The margin in 2024 was twenty-eight points, in line with the county's deep historical pattern.
Colusa County's loyalty is rooted in its place. Median household income of $75,672, a 39% non-Hispanic-white share, and a population of 21,984 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 Madera County and Tulare County.
