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
See also Population estimate for other years:
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%