California Citizen Population By County in 2021 (ACS-5Yrs)
Updated on March 28, 2026.
Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2021, the citizen population for California was 34,596,525 and represented 87.69% of the total California population.
Among all California counties, Los Angeles had the highest citizen population (8.47M), followed by San Diego (2.98M), and Orange (2.79M).
In terms of percentages, Alpine had the highest percentage of its population being citizens (99.26%), followed by Plumas (98.68%), and Tuolumne (98.18%).
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 2021
California Citizen Population By County in 2021
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| County | Citizen Population | % of County Population |
|---|---|---|
| Los Angeles | 8469980 | 84.53 |
| San Diego | 2978065 | 90.35 |
| Orange | 2784755 | 87.49 |
| Riverside | 2171870 | 90.14 |
| San Bernardino | 1953425 | 89.98 |
| Santa Clara | 1572340 | 81.38 |
| Sacramento | 1434375 | 91.26 |
| Alameda | 1424550 | 85.14 |
| Contra Costa | 1038150 | 89.37 |
| Fresno | 894060 | 89.13 |
| Kern | 796510 | 87.95 |
| Ventura | 761015 | 90.03 |
| San Francisco | 755525 | 87.25 |
| San Joaquin | 685080 | 88.81 |
| San Mateo | 653410 | 85.69 |
| Stanislaus | 493305 | 89.56 |
| Sonoma | 449740 | 91.32 |
| Solano | 415505 | 92.04 |
| Tulare | 405240 | 86.04 |
| Santa Barbara | 384520 | 85.90 |
| Placer | 384095 | 95.95 |
| Monterey | 349125 | 79.54 |
| San Luis Obispo | 269210 | 95.21 |
| Santa Cruz | 244435 | 89.82 |
| Marin | 237890 | 90.66 |
| Merced | 235785 | 84.47 |
| Butte | 210285 | 96.51 |
| Yolo | 191490 | 88.36 |
| El Dorado | 183980 | 96.54 |
| Shasta | 176805 | 97.18 |
| Imperial | 153550 | 85.28 |
| Madera | 136660 | 87.43 |
| Kings | 133650 | 87.99 |
| Humboldt | 133085 | 97.13 |
| Napa | 124585 | 89.76 |
| Nevada | 99005 | 96.98 |
| Sutter | 89020 | 89.85 |
| Mendocino | 84705 | 92.54 |
| Yuba | 76160 | 94.72 |
| Lake | 64665 | 95.45 |
| Tehama | 62810 | 96.12 |
| San Benito | 56490 | 89.20 |
| Tuolumne | 54240 | 98.18 |
| Calaveras | 44435 | 97.98 |
| Siskiyou | 43120 | 97.67 |
| Amador | 39095 | 97.51 |
| Lassen | 31580 | 95.84 |
| Del Norte | 26340 | 95.25 |
| Glenn | 25845 | 90.13 |
| Plumas | 19370 | 98.68 |
| Colusa | 18670 | 85.72 |
| Inyo | 18075 | 96.12 |
| Mariposa | 16755 | 97.27 |
| Trinity | 15350 | 97.03 |
| Mono | 11990 | 90.22 |
| Modoc | 8455 | 96.91 |
| Sierra | 2985 | 96.92 |
| Alpine | 1335 | 99.26 |
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