California 2019 Population By County
Updated on June 22, 2021.

According to the US Census Bureau population estimates, there were 39,512,223 people living in California in 2019. Los Angeles County was the most populated county with 10,039,107 residents, followed by San Diego County with 3,338,330 residents, and Orange County with 3,175,692 residents. Alpine County with a population of 1,129 was the least populated county in California in 2019.

Use the map below to interactively explore the population of each county in California in 2019. The data can also be explored further by sorting and filtering with the table below.

California 2019 Population By County
See also Population estimate for other years:
Table of California 2019 Population By County
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County Population % of State Population
Alameda 1,671,329 4.23%
Alpine 1,129 0.00%
Amador 39,752 0.10%
Butte 219,186 0.56%
Calaveras 45,905 0.12%
Colusa 21,547 0.06%
Contra Costa 1,153,526 2.92%
Del Norte 27,812 0.07%
El Dorado 192,843 0.49%
Fresno 999,101 2.53%
Glenn 28,393 0.07%
Humboldt 135,558 0.34%
Imperial 181,215 0.46%
Inyo 18,039 0.05%
Kern 900,202 2.28%
Kings 152,940 0.39%
Lake 64,386 0.16%
Lassen 30,573 0.08%
Los Angeles 10,039,107 25.41%
Madera 157,327 0.40%
Marin 258,826 0.66%
Mariposa 17,203 0.04%
Mendocino 86,749 0.22%
Merced 277,680 0.70%
Modoc 8,841 0.02%
Mono 14,444 0.04%
Monterey 434,061 1.10%
Napa 137,744 0.35%
Nevada 99,755 0.25%
Orange 3,175,692 8.04%
Placer 398,329 1.01%
Plumas 18,807 0.05%
Riverside 2,470,546 6.25%
Sacramento 1,552,058 3.93%
San Benito 62,808 0.16%
San Bernardino 2,180,085 5.52%
San Diego 3,338,330 8.45%
San Francisco 881,549 2.23%
San Joaquin 762,148 1.93%
San Luis Obispo 283,111 0.72%
San Mateo 766,573 1.94%
Santa Barbara 446,499 1.13%
Santa Clara 1,927,852 4.88%
Santa Cruz 273,213 0.69%
Shasta 180,080 0.46%
Sierra 3,005 0.01%
Siskiyou 43,539 0.11%
Solano 447,643 1.13%
Sonoma 494,336 1.25%
Stanislaus 550,660 1.39%
Sutter 96,971 0.25%
Tehama 65,084 0.17%
Trinity 12,285 0.03%
Tulare 466,195 1.18%
Tuolumne 54,478 0.14%
Ventura 846,006 2.14%
Yolo 220,500 0.56%
Yuba 78,668 0.20%