California Population By County in 2018
Updated on June 22, 2021.
According to the US Census Bureau population estimates, there were 39,461,588 people living in California in 2018. Los Angeles County was the most populated county with 10,073,906 residents, followed by San Diego County with 3,333,861 residents, and Orange County with 3,175,973 residents. Alpine County with a population of 1,089 was the least populated county in California in 2018.
Use the map below to interactively explore the population of each county in California in 2018. The data can also be explored further by sorting and filtering with the table below.
Hover/Click on the counties to see the values.
California Population By County in 2018
Table of California Population By County in 2018
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| County | Population | % of State Population |
|---|---|---|
| Alameda | 1,666,756 | 4.22% |
| Alpine | 1,089 | 0.00% |
| Amador | 39,405 | 0.10% |
| Butte | 230,339 | 0.58% |
| Calaveras | 45,698 | 0.12% |
| Colusa | 21,418 | 0.05% |
| Contra Costa | 1,150,519 | 2.92% |
| Del Norte | 27,740 | 0.07% |
| El Dorado | 190,746 | 0.48% |
| Fresno | 991,950 | 2.51% |
| Glenn | 27,967 | 0.07% |
| Humboldt | 136,244 | 0.35% |
| Imperial | 181,523 | 0.46% |
| Inyo | 17,946 | 0.05% |
| Kern | 893,758 | 2.27% |
| Kings | 151,382 | 0.38% |
| Lake | 64,317 | 0.16% |
| Lassen | 30,618 | 0.08% |
| Los Angeles | 10,073,906 | 25.53% |
| Madera | 156,882 | 0.40% |
| Marin | 259,662 | 0.66% |
| Mariposa | 17,405 | 0.04% |
| Mendocino | 87,401 | 0.22% |
| Merced | 274,151 | 0.70% |
| Modoc | 8,800 | 0.02% |
| Mono | 14,403 | 0.04% |
| Monterey | 433,950 | 1.10% |
| Napa | 138,789 | 0.35% |
| Nevada | 99,508 | 0.25% |
| Orange | 3,175,973 | 8.05% |
| Placer | 392,330 | 0.99% |
| Plumas | 18,741 | 0.05% |
| Riverside | 2,445,789 | 6.20% |
| Sacramento | 1,538,746 | 3.90% |
| San Benito | 61,467 | 0.16% |
| San Bernardino | 2,166,753 | 5.49% |
| San Diego | 3,333,861 | 8.45% |
| San Francisco | 880,696 | 2.23% |
| San Joaquin | 752,491 | 1.91% |
| San Luis Obispo | 283,354 | 0.72% |
| San Mateo | 768,681 | 1.95% |
| Santa Barbara | 445,780 | 1.13% |
| Santa Clara | 1,932,337 | 4.90% |
| Santa Cruz | 273,841 | 0.69% |
| Shasta | 179,709 | 0.46% |
| Sierra | 2,997 | 0.01% |
| Siskiyou | 43,550 | 0.11% |
| Solano | 445,725 | 1.13% |
| Sonoma | 498,643 | 1.26% |
| Stanislaus | 548,126 | 1.39% |
| Sutter | 96,348 | 0.24% |
| Tehama | 64,018 | 0.16% |
| Trinity | 12,567 | 0.03% |
| Tulare | 464,589 | 1.18% |
| Tuolumne | 54,387 | 0.14% |
| Ventura | 848,142 | 2.15% |
| Yolo | 220,118 | 0.56% |
| Yuba | 77,557 | 0.20% |
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