The following is a list of California locations by voter registration.

In July 2025, California had 22,900,896 registered voters, comprising 85.04% of its total eligible voters. Of those registered voters, 10,367,321 (45.27 percent) were registered Democrats, 5,776,356 (25.22 percent) were Republicans and, 5,116,983 were No Party Preference (22.34 percent).

The county with the highest percentage of registered Republicans was Modoc County, with registered Republicans comprising half of the registered voters. The ten counties with the highest percentage of registered Republicans are relatively small, with an average population of 91,776.

Similarly, the counties with the ten lowest percentages of registered voters are all relatively small, with the exception of Monterey County. Kings County had the lowest percentage of registered voters, with just 34.7 percent of its population registered to vote. The two smallest counties in California by population also had the highest percentage of registered voters; Sierra County had the highest percentage, with 73.1 percent of its population registered to vote.

Inglewood had the highest percentage of registered Democrats of any place in California. The ten places with the highest percentage of registered Democrats all had high percentages of minorities (see California locations by race) and relatively low levels of income. On the other hand, Marin County, the highest income county in California by per capita income, had many more registered Democrats than Republicans. Further, of the ten highest-income counties in California by per capita income, all but Placer County, Orange County and El Dorado County had more registered Democrats than Republicans. But in yet another reversal, the place with the highest percentage of registered Republicans was Villa Park, which also has very high levels of income. Of the ten places in California with the highest percentage of registered Republicans, most have incomes above the state average (see California locations by income).

Entire state

Total population 39.43 Million   Registered votersPercentage of registered voters with respect to total population. Percentages of party members with respect to registered voters follow. 22,900,896 58.1%     Democratic 10,367,321 45.27%     Republican 5,776,356 25.22%     Democratic–Republican spread +4,590,965 +20.05%     Other 1,258,955 7.17%     No party preference 5,116,983 22.34%

Counties

County Population Registered voters Democratic Republican D–R spread Other No party preference Alameda 1,666,753 53.0% 55.4% 10.81% +44.6% 4.15% 29.6% Alpine 1,101 70.2% 41.3% 25.9% +15.4% 5.8% 27.0% Amador 39,383 69.0% 28.3% 43.7% -15.4% 6.6% 21.3% Butte 231,256 52.9% 34.4% 33.7% +0.6% 7.0% 24.8% Calaveras 45,602 64.6% 26.9% 41.4% -14.5% 8.2% 23.6% Colusa 21,627 40.8% 30.7% 39.4% -10.9% 4.2% 25.7% Contra Costa 1,150,215 54.8% 48.5% 19.4% +29.1% 4.5% 27.7% Del Norte 27,828 49.4% 30.3% 35.7% -5.4% 7.6% 26.4% El Dorado 190,678 63.9% 28.5% 39.7% -11.3% 7.1% 24.6% Fresno 994,400 46.3% 37.5% 32.6% +4.8% 5.1% 24.8% Glenn 28,047 45.7% 27.7% 41.9% -14.2% 5.5% 24.9% Humboldt 136,373 57.3% 43.6% 22.6% +20.9% 7.6% 26.2% Imperial 181,827 38.4% 47.1% 18.2% +28.9% 4.6% 30.0% Inyo 17,987 56.5% 30.1% 39.0% -8.9% 6.4% 24.4% Kern 896,764 42.3% 33.1% 34.9% -1.7% 5.5% 26.5% Kings 151,366 34.7% 32.3% 39.9% -7.6% 4.7% 23.0% Lake 64,382 51.0% 37.3% 26.4% +10.9% 6.7% 29.5% Lassen 30,802 46.9% 19.5% 48.6% -29.2% 7.7% 24.2% Los Angeles 10,105,518 53.4% 49.7% 16.7% +33.0% 4.8% 28.8% Madera 157,672 36.8% 31.2% 37.9% -6.6% 5.4% 25.4% Marin 259,666 62.3% 55.3% 14.4% +40.9% 4.7% 25.9% Mariposa 17,471 62.3% 27.6% 42.5% -14.8% 7.4% 22.5% Mendocino 87,606 56.8% 46.7% 19.5% +27.2% 8.0% 25.6% Merced 274,765 35.8% 42.4% 27.1% +15.4% 4.5% 26.0% Modoc 8,777 56.3% 21.2% 49.0% -27.9% 6.9% 22.9% Mono 14,250 47.0% 34.1% 30.2% +3.9% 6.2% 29.4% Monterey 435,594 43.5% 48.7% 20.2% +28.6% 4.4% 26.6% Napa 139,417 56.0% 45.3% 21.7% +23.6% 5.6% 27.4% Nevada 99,696 68.7% 36.0% 32.5% +3.5% 13.8% 11.4% Orange 3,185,968 49.9% 33.3% 34.0% -0.7% 4.2% 28.5% Placer 393,149 60.5% 27.9% 41.0% -13.1% 6.1% 25.0% Plumas 18,804 65.8% 27.7% 41.9% -14.2% 7.0% 23.4% Riverside 2,450,758 43.2% 36.8% 32.1% +4.7% 5.4% 25.7% Sacramento 1,540,975 50.6% 42.0% 25.2% +16.8% 5.7% 27.1% San Benito 61,537 50.4% 44.6% 25.4% +19.2% 4.3% 25.7% San Bernardino 2,171,603 44.3% 38.8% 28.8% +10.0% 6.0% 26.4% San Diego 3,343,364 52.2% 35.7% 27.1% +8.6% 5.6% 31.6% San Francisco 883,305 55.8% 56.8% 6.4% +50.4% 3.9% 32.9% San Joaquin 752,660 46.4% 41.0% 28.4% +12.6% 4.9% 25.7% San Luis Obispo 284,010 60.0% 34.3% 34.4% -0.1% 6.2% 25.1% San Mateo 769,545 52.6% 50.0% 14.8% +35.2% 3.9% 31.3% Santa Barbara 446,527 48.9% 41.9% 25.3% +16.6% 5.2% 27.6% Santa Clara 1,937,570 46.2% 45.2% 16.9% +28.3% 3.4% 34.5% Santa Cruz 274,255 58.7% 54.2% 13.7% +40.5% 8.8% 27.0% Shasta 180,040 56.2% 22.8% 45.8% -23.0% 6.1% 25.3% Sierra 2,987 73.1% 27.3% 39.9% -12.6% 9.8% 23.0% Siskiyou 43,724 63.0% 29.6% 38.0% -8.4% 7.7% 24.7% Solano 446,610 52.8% 45.1% 21.2% +23.9% 5.5% 28.2% Sonoma 499,942 55.5% 51.5% 17.8% +33.7% 5.4% 25.3% Stanislaus 549,815 45.7% 36.8% 34.3% +2.5% 5.8% 23.1% Sutter 96,807 48.3% 29.3% 38.7% -9.4% 6.6% 25.4% Tehama 63,916 52.1% 24.8% 42.4% -18.1% 7.4% 25.9% Trinity 12,535 60.0% 31.3% 32.0% -0.7% 17.6% 19.1% Tulare 465,861 36.5% 31.0% 38.4% -7.4% 5.1% 25.5% Tuolumne 54,539 58.9% 28.6% 40.8% -12.2% 6.0% 24.6% Ventura 850,967 53.5% 39.4% 29.0% +10.4% 6.1% 25.5% Yolo 220,408 51.1% 47.0% 19.3% +27.7% 5.6% 28.1% Yuba 78,041 43.4% 26.7% 35.8% -9.1% 8.0% 29.5%

Cities