California 2019 Population By County
Updated on December 2, 2021.

According to the US Census Bureau population estimates, there were 39,437,610 people living in California in 2019. Los Angeles County was the most populated county with 10,011,602 residents, followed by San Diego County with 3,330,459 residents, and Orange County with 3,170,851 residents. Alpine County with a population of 1,113 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 1,668,412 4.23
Alpine 1,113 0.00
Amador 39,693 0.10
Butte 218,726 0.56
Calaveras 46,119 0.12
Colusa 21,474 0.05
Contra Costa 1,152,883 2.92
Del Norte 27,903 0.07
El Dorado 193,057 0.49
Fresno 997,847 2.53
Glenn 28,445 0.07
Humboldt 135,839 0.34
Imperial 180,439 0.46
Inyo 17,993 0.05
Kern 898,898 2.28
Kings 152,727 0.39
Lake 64,463 0.16
Lassen 30,694 0.08
Los Angeles 10,011,602 25.39
Madera 156,717 0.40
Marin 259,085 0.66
Mariposa 17,117 0.04
Mendocino 86,932 0.22
Merced 277,114 0.70
Modoc 8,866 0.02
Mono 14,450 0.04
Monterey 433,380 1.10
Napa 137,678 0.35
Nevada 99,648 0.25
Orange 3,170,851 8.04
Placer 398,918 1.01
Plumas 19,052 0.05
Riverside 2,465,569 6.25
Sacramento 1,551,660 3.93
San Benito 62,803 0.16
San Bernardino 2,177,279 5.52
San Diego 3,330,459 8.45
San Francisco 878,826 2.23
San Joaquin 761,571 1.93
San Luis Obispo 282,728 0.72
San Mateo 764,810 1.94
Santa Barbara 445,464 1.13
Santa Clara 1,922,411 4.88
Santa Cruz 272,870 0.69
Shasta 179,645 0.46
Sierra 2,959 0.01
Siskiyou 43,663 0.11
Solano 447,434 1.14
Sonoma 492,318 1.25
Stanislaus 549,761 1.39
Sutter 96,910 0.25
Tehama 65,186 0.17
Trinity 12,337 0.03
Tulare 465,751 1.18
Tuolumne 54,290 0.14
Ventura 844,203 2.14
Yolo 220,019 0.56
Yuba 78,549 0.20