United States presidential election in California, 2020

In the 2020 United States presidential election, California voted for the incumbent Democratic President, William C. Holland, over the Republican nominee, Senator John Dickenson of Mississippi.

As Holland won nationally in a massive landslide, taking 66.05% of the vote nationwide, and dominating many states by record landslide margins, California weighed in as a whopping 20.20% more Democratic than the national average. Holland earned 76.63% of the popular vote in California, the highest total ever won by a presidential candidate from either party there, beating Dickenson, who earned 23.05%, by a margin of 53.58%. He became the first President since Franklin Roosevelt in 1936 to sweep all 58 of California's counties, and the first in the modern era to sweep all fifty-three of its congressional districts. He became the first Democrat since Franklin Roosevelt in 1940 to win Sutter County, the first since Lyndon Johnson in 1964 to win Calaveras, Colusa, Glenn, Inyo, Kern, and Tulare Counties, the first since Hubert Humphrey in 1968 to win Kings County, and the first since Jimmy Carter in 1976 to win Shasta, Lassen, Madera, and Sierra Counties. He was also the first since Carter to obtain an absolute majority in Tehama and Plumas Counties, and the first since Johnson to do so in Butte and El Dorado Counties.

Holland did exceptionally well throughout the state, setting new records for a presidential candidate from either party. He absolutely dominated in the Bay Area, breaking 90% in San Francisco, Marin, Alameda, San Mateo, and Santa Clara. He displayed a similar level of dominance in Central and Southern California, breaking 80% in Los Angeles, Imperial, Monterey, Contra Costa, Solano, Yolo, Napa, and Sonoma, and 70% in San Diego, Santa Barbara, San Benito, Alpine, Mendocino, and Humboldt Counties. He broke 60% in several other counties, including Orange, Riverside, San Bernandino, Fresno, Ventura, San Luis Obsipo, Stanislaus, Merced, Nevada, San Joaquin, Lake, Trinity, Del Norte, and Siskiyou.