California Citizen Population By County in 2020 (ACS-5Yrs)
Updated on March 28, 2026.
Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2020, the citizen population for California was 34,415,900 and represented 87.47% of the total California population.
Among all California counties, Los Angeles had the highest citizen population (8.46M), followed by San Diego (2.99M), and Orange (2.77M).
In terms of percentages, Sierra had the highest percentage of its population being citizens (99.31%), followed by Trinity (98.96%), and Plumas (98.75%).
The chart and table below shows the citizen population of each county and the percentage of each county's population that were citizens.
You can see similar information for other states and by state for the United States.
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Data Source: US Census - ACS 5-Year (CVAP).
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California Citizen Population By County in 2020
California Citizen Population By County in 2020
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| County | Citizen Population | % of County Population |
|---|---|---|
| Los Angeles | 8457520 | 84.23 |
| San Diego | 2990855 | 89.98 |
| Orange | 2764775 | 87.21 |
| Riverside | 2190000 | 89.83 |
| San Bernardino | 1942810 | 89.84 |
| Santa Clara | 1566230 | 81.39 |
| Alameda | 1414300 | 85.12 |
| Sacramento | 1401875 | 91.15 |
| Contra Costa | 1023410 | 89.16 |
| Fresno | 876385 | 88.51 |
| Kern | 782200 | 87.65 |
| San Francisco | 764685 | 87.41 |
| Ventura | 758950 | 89.75 |
| San Joaquin | 666045 | 88.62 |
| San Mateo | 655510 | 85.62 |
| Stanislaus | 488360 | 89.41 |
| Sonoma | 451750 | 90.93 |
| Solano | 409865 | 92.20 |
| Tulare | 399230 | 86.05 |
| Santa Barbara | 380005 | 85.42 |
| Placer | 376860 | 96.19 |
| Monterey | 344870 | 79.65 |
| San Luis Obispo | 269605 | 95.43 |
| Santa Cruz | 245570 | 89.90 |
| Marin | 235305 | 90.70 |
| Merced | 230730 | 84.31 |
| Butte | 215455 | 96.47 |
| Yolo | 192530 | 88.00 |
| El Dorado | 183235 | 96.27 |
| Shasta | 174125 | 97.13 |
| Imperial | 153540 | 85.03 |
| Madera | 135220 | 86.72 |
| Kings | 132930 | 87.98 |
| Humboldt | 132585 | 97.42 |
| Napa | 124115 | 89.57 |
| Nevada | 96565 | 97.13 |
| Sutter | 86660 | 89.98 |
| Mendocino | 80440 | 92.34 |
| Yuba | 73580 | 94.91 |
| Tehama | 61730 | 96.19 |
| Lake | 61550 | 95.76 |
| San Benito | 55410 | 90.03 |
| Tuolumne | 53385 | 98.60 |
| Calaveras | 44955 | 98.09 |
| Siskiyou | 42625 | 97.96 |
| Amador | 38095 | 97.62 |
| Lassen | 29395 | 96.06 |
| Del Norte | 26315 | 95.03 |
| Glenn | 24785 | 88.33 |
| Plumas | 18610 | 98.75 |
| Colusa | 18330 | 85.30 |
| Inyo | 17270 | 96.32 |
| Mariposa | 16865 | 97.37 |
| Mono | 12975 | 90.14 |
| Trinity | 12410 | 98.96 |
| Modoc | 8495 | 95.94 |
| Sierra | 2880 | 99.31 |
| Alpine | 1140 | 98.28 |
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