| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | D | 217,424 | 158,901 | 387,704 | |
| 2020 | D | 251,388 | 162,207 | 422,825 | |
| 2016 | D | 194,402 | 132,323 | 356,107 | |
| 2012 | D | 170,929 | 147,958 | 327,712 | |
| 2008 | D | 187,601 | 145,853 | 341,041 | |
| 2004 | R | 148,859 | 160,314 | 313,193 | |
| 2000 | R | 133,258 | 136,173 | 282,692 | |
| 1996 | D | 110,772 | 109,202 | 251,194 | |
| 1992 | D | 99,011 | 94,911 | 267,647 | |
| 1988 | R | 89,065 | 147,604 | 239,473 | |
| 1984 | R | 66,550 | 151,383 | 220,462 | |
| 1980 | R | 56,311 | 114,930 | 190,650 | |
| 1976 | R | 68,529 | 82,670 | 155,400 | |
| 1972 | R | 49,307 | 95,310 | 150,805 | |
| 1968 | R | 47,794 | 59,705 | 116,261 | |
| 1964 | D | 57,805 | 40,264 | 98,238 | |
| 1960 | D | 35,334 | 35,074 | 70,723 | |
| 1956 | R | 26,276 | 26,342 | 52,767 | |
| 1952 | R | 21,489 | 23,392 | 45,137 | |
| 1948 | D | 18,100 | 13,930 | 33,049 | |
| 1944 | D | 16,342 | 11,071 | 27,544 | |
| 1940 | D | 15,182 | 11,225 | 26,634 | |
| 1936 | D | 13,384 | 7,579 | 21,198 | |
| 1932 | D | 10,903 | 6,908 | 18,535 | |
| 1928 | R | 3,717 | 9,017 | 12,851 | |
| 1924 | R | 911 | 5,705 | 8,755 | |
| 1920 | R | 1,305 | 5,231 | 6,883 | |
| 1916 | R | 2,835 | 3,980 | 7,213 | |
| 1912 | D | 2,108 | 0 | 4,833 | |
| 1908 | R | 1,181 | 1,864 | 3,295 | |
| 1904 | R | 840 | 1,995 | 3,124 | |
| 1900 | R | 1,333 | 1,708 | 3,190 | |
| 1896 | R | 1,465 | 1,553 | 3,081 | |
| 1892 | R | 958 | 1,283 | 2,753 | |
| 1888 | R | 906 | 1,107 | 2,056 | |
| 1884 | R | 603 | 749 | 1,388 | |
| 1880 | R | 522 | 599 | 1,125 | |
| 1876 | R | 591 | 608 | 1,199 |
Ventura County blends affluent beachside cities with agricultural inland valleys, producing a Democratic lean in presidential races that has nonetheless narrowed over multiple cycles as Latino voter preferences have shifted.
The 2008 election was the turning point, when the Democratic candidate carried the county by twelve points. The 2024 margin was fifteen points, in line with the county's new direction.
The demographics suggest why. A population of 837,469, a 52% non-Hispanic-white share, and a median household income of $109,797 situate the county in the broader realignment patterns of recent cycles. The county's voting pattern over the last decade is most similar to that of San Diego County and Lake County.
