California Citizen Voting-age Population By County in 2021 (ACS-5Yrs)
Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2021, the citizen voting-age population for California was 25,916,215 and represented 65.69% of the total California population.
Among all California counties, Los Angeles had the highest citizen voting-age population (6.39M), followed by San Diego (2.29M), and Orange (2.11M).
In terms of percentages, Amador had the highest percentage of its population being citizens of voting-age (82.34%), followed by Sierra (81.49%), and Plumas (81.30%).
The chart and table below shows the citizen voting-age population of each county and the percentage of each county's population that were citizens of voting-age.
You can see similar information for other states and by state for the United States.
| County | Citizen Voting-age Population | % of County Population |
|---|---|---|
| Los Angeles | 6387005 | 63.75 |
| San Diego | 2286385 | 69.36 |
| Orange | 2111655 | 66.34 |
| Riverside | 1579015 | 65.54 |
| San Bernardino | 1390830 | 64.06 |
| Santa Clara | 1178785 | 61.01 |
| Alameda | 1100530 | 65.78 |
| Sacramento | 1080055 | 68.72 |
| Contra Costa | 785620 | 67.63 |
| San Francisco | 643100 | 74.27 |
| Fresno | 615025 | 61.31 |
| Ventura | 571925 | 67.66 |
| Kern | 539335 | 59.55 |
| San Mateo | 504885 | 66.22 |
| San Joaquin | 480780 | 62.33 |
| Sonoma | 355355 | 72.15 |
| Stanislaus | 346615 | 62.93 |
| Solano | 317100 | 70.24 |
| Placer | 295940 | 73.92 |
| Santa Barbara | 286750 | 64.06 |
| Tulare | 264295 | 56.11 |
| Monterey | 239145 | 54.48 |
| San Luis Obispo | 220035 | 77.81 |
| Santa Cruz | 193490 | 71.10 |
| Marin | 187810 | 71.58 |
| Butte | 166265 | 76.31 |
| Merced | 155490 | 55.70 |
| Yolo | 148075 | 68.33 |
| El Dorado | 146205 | 76.72 |
| Shasta | 137765 | 75.72 |
| Humboldt | 107075 | 78.15 |
| Imperial | 103240 | 57.34 |
| Napa | 96890 | 69.81 |
| Madera | 94350 | 60.36 |
| Kings | 93490 | 61.55 |
| Nevada | 81525 | 79.86 |
| Mendocino | 65740 | 71.82 |
| Sutter | 63575 | 64.17 |
| Yuba | 54020 | 67.19 |
| Lake | 50350 | 74.32 |
| Tehama | 47115 | 72.10 |
| Tuolumne | 44860 | 81.20 |
| San Benito | 40255 | 63.56 |
| Calaveras | 36760 | 81.06 |
| Siskiyou | 34180 | 77.42 |
| Amador | 33015 | 82.34 |
| Lassen | 26185 | 79.47 |
| Del Norte | 20555 | 74.33 |
| Glenn | 18235 | 63.59 |
| Plumas | 15960 | 81.30 |
| Inyo | 14115 | 75.06 |
| Mariposa | 13900 | 80.70 |
| Colusa | 12930 | 59.37 |
| Trinity | 12805 | 80.94 |
| Mono | 9525 | 71.67 |
| Modoc | 6745 | 77.31 |
| Sierra | 2510 | 81.49 |
| Alpine | 1045 | 77.69 |
