| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | D | 100,998 | 27,978 | 134,981 | |
| 2020 | D | 114,246 | 26,937 | 145,649 | |
| 2016 | D | 95,249 | 22,438 | 130,012 | |
| 2012 | D | 90,805 | 24,047 | 120,385 | |
| 2008 | D | 98,745 | 25,244 | 127,736 | |
| 2004 | D | 89,102 | 30,354 | 122,084 | |
| 2000 | D | 66,618 | 29,627 | 108,350 | |
| 1996 | D | 58,250 | 27,766 | 103,062 | |
| 1992 | D | 66,183 | 24,916 | 113,992 | |
| 1988 | D | 63,133 | 37,728 | 102,611 | |
| 1984 | D | 49,091 | 41,652 | 92,147 | |
| 1980 | R | 32,346 | 37,347 | 85,804 | |
| 1976 | D | 37,772 | 31,872 | 73,969 | |
| 1972 | R | 32,336 | 34,799 | 69,759 | |
| 1968 | R | 20,492 | 25,365 | 49,944 | |
| 1964 | D | 26,714 | 18,836 | 45,644 | |
| 1960 | R | 16,659 | 24,858 | 41,704 | |
| 1956 | R | 12,574 | 22,109 | 34,776 | |
| 1952 | R | 11,080 | 22,910 | 34,361 | |
| 1948 | R | 9,862 | 15,395 | 26,690 | |
| 1944 | R | 9,357 | 11,102 | 20,637 | |
| 1940 | R | 10,683 | 11,453 | 22,486 | |
| 1936 | D | 9,326 | 8,260 | 17,908 | |
| 1932 | D | 8,246 | 6,005 | 14,990 | |
| 1928 | R | 3,688 | 8,275 | 12,075 | |
| 1924 | R | 801 | 5,402 | 8,879 | |
| 1920 | R | 1,957 | 5,285 | 7,974 | |
| 1916 | D | 4,511 | 4,228 | 9,446 | |
| 1912 | D | 2,875 | 0 | 7,152 | |
| 1908 | R | 1,643 | 2,886 | 5,275 | |
| 1904 | R | 1,105 | 2,626 | 4,329 | |
| 1900 | R | 1,635 | 2,173 | 4,085 | |
| 1896 | R | 1,960 | 1,969 | 4,082 | |
| 1892 | R | 1,512 | 1,843 | 4,112 | |
| 1888 | R | 1,750 | 1,996 | 3,940 | |
| 1884 | R | 1,365 | 1,667 | 3,105 | |
| 1880 | R | 1,102 | 1,236 | 2,451 | |
| 1876 | R | 1,132 | 1,537 | 2,669 |
Santa Cruz County consistently posts some of the widest Democratic presidential margins in the state, driven by a dense concentration of university affiliates, tech workers, and long-established progressive communities along Monterey Bay.
The unraveling was not abrupt. The Democratic margin in Santa Cruz County peaked at sixty points in 2020; it narrowed steadily over the late twentieth century. The 1984 election delivered the county to the Republican party for the first time in many years, by a margin of eight points. By 2024, the margin had widened further.
The economic and demographic context is severe. Santa Cruz County's median household income of $111,093 is among the lowest of any county in the United States; 12% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of Sonoma County and Multnomah County.
