California 2020 Population By County
Updated on December 2, 2021.

According to the US Census Bureau population estimates, there were 39,368,078 people living in California in 2020. Los Angeles County was the most populated county with 9,943,046 residents, followed by San Diego County with 3,332,427 residents, and Orange County with 3,166,857 residents. Alpine County with a population of 1,119 was the least populated county in California in 2020.

Use the map below to interactively explore the population of each county in California in 2020. The data can also be explored further by sorting and filtering with the table below.

California 2020 Population By County
See also Population estimate for other years:
Table of California 2020 Population By County
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County Population % of State Population
Alameda 1,662,323 4.22
Alpine 1,119 0.00
Amador 40,083 0.10
Butte 212,744 0.54
Calaveras 46,308 0.12
Colusa 21,558 0.06
Contra Costa 1,152,333 2.93
Del Norte 27,968 0.07
El Dorado 192,925 0.49
Fresno 1,000,918 2.54
Glenn 28,283 0.07
Humboldt 134,977 0.34
Imperial 180,267 0.46
Inyo 18,046 0.05
Kern 901,362 2.29
Kings 152,692 0.39
Lake 64,479 0.16
Lassen 30,016 0.08
Los Angeles 9,943,046 25.26
Madera 157,761 0.40
Marin 257,332 0.65
Mariposa 17,160 0.04
Mendocino 86,061 0.22
Merced 279,252 0.71
Modoc 8,763 0.02
Mono 14,534 0.04
Monterey 430,906 1.10
Napa 135,965 0.35
Nevada 99,606 0.25
Orange 3,166,857 8.04
Placer 402,950 1.02
Plumas 18,967 0.05
Riverside 2,489,188 6.32
Sacramento 1,559,146 3.96
San Benito 64,055 0.16
San Bernardino 2,189,183 5.56
San Diego 3,332,427 8.47
San Francisco 866,606 2.20
San Joaquin 767,967 1.95
San Luis Obispo 282,249 0.72
San Mateo 758,308 1.93
Santa Barbara 444,766 1.13
Santa Clara 1,907,105 4.84
Santa Cruz 269,925 0.69
Shasta 179,027 0.46
Sierra 2,920 0.01
Siskiyou 43,245 0.11
Solano 446,935 1.14
Sonoma 489,819 1.24
Stanislaus 550,081 1.40
Sutter 96,385 0.25
Tehama 64,494 0.16
Trinity 12,216 0.03
Tulare 468,680 1.19
Tuolumne 54,515 0.14
Ventura 841,387 2.14
Yolo 219,728 0.56
Yuba 80,160 0.20