California 2017 Population By County
Updated on June 22, 2021.
According to the US Census Bureau population estimates, there were 39,358,497 people living in California in 2017. Los Angeles County was the most populated county with 10,103,711 residents, followed by San Diego County with 3,321,237 residents, and Orange County with 3,174,289 residents. Alpine County with a population of 1,111 was the least populated county in California in 2017.
Use the map below to interactively explore the population of each county in California in 2017. The data can also be explored further by sorting and filtering with the table below.
California 2017 Population By County
Table of California 2017 Population By County
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| County | Population | % of State Population |
|---|---|---|
| Alameda | 1,660,196 | 4.22% |
| Alpine | 1,111 | 0.00% |
| Amador | 38,529 | 0.10% |
| Butte | 228,696 | 0.58% |
| Calaveras | 45,681 | 0.12% |
| Colusa | 21,579 | 0.06% |
| Contra Costa | 1,145,535 | 2.91% |
| Del Norte | 27,351 | 0.07% |
| El Dorado | 188,679 | 0.48% |
| Fresno | 985,238 | 2.50% |
| Glenn | 27,926 | 0.07% |
| Humboldt | 136,507 | 0.35% |
| Imperial | 181,649 | 0.46% |
| Inyo | 17,868 | 0.05% |
| Kern | 887,356 | 2.26% |
| Kings | 149,665 | 0.38% |
| Lake | 64,111 | 0.16% |
| Lassen | 30,920 | 0.08% |
| Los Angeles | 10,103,711 | 25.67% |
| Madera | 155,423 | 0.40% |
| Marin | 259,749 | 0.66% |
| Mariposa | 17,414 | 0.04% |
| Mendocino | 87,576 | 0.22% |
| Merced | 271,096 | 0.69% |
| Modoc | 8,876 | 0.02% |
| Mono | 14,354 | 0.04% |
| Monterey | 434,534 | 1.10% |
| Napa | 139,878 | 0.36% |
| Nevada | 99,367 | 0.25% |
| Orange | 3,174,289 | 8.07% |
| Placer | 385,115 | 0.98% |
| Plumas | 18,660 | 0.05% |
| Riverside | 2,414,964 | 6.14% |
| Sacramento | 1,527,301 | 3.88% |
| San Benito | 60,164 | 0.15% |
| San Bernardino | 2,150,945 | 5.47% |
| San Diego | 3,321,237 | 8.44% |
| San Francisco | 878,040 | 2.23% |
| San Joaquin | 743,296 | 1.89% |
| San Luis Obispo | 282,481 | 0.72% |
| San Mateo | 768,901 | 1.95% |
| Santa Barbara | 445,298 | 1.13% |
| Santa Clara | 1,932,510 | 4.91% |
| Santa Cruz | 274,856 | 0.70% |
| Shasta | 179,384 | 0.46% |
| Sierra | 3,002 | 0.01% |
| Siskiyou | 43,622 | 0.11% |
| Solano | 443,511 | 1.13% |
| Sonoma | 502,469 | 1.28% |
| Stanislaus | 544,717 | 1.38% |
| Sutter | 96,204 | 0.24% |
| Tehama | 63,847 | 0.16% |
| Trinity | 12,726 | 0.03% |
| Tulare | 462,308 | 1.18% |
| Tuolumne | 53,976 | 0.14% |
| Ventura | 849,044 | 2.16% |
| Yolo | 218,477 | 0.56% |
| Yuba | 76,578 | 0.20% |
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