California 2010 Population By County
Updated on December 2, 2021.

According to the US Census Bureau population estimates, there were 37,319,550 people living in California in 2010. Los Angeles County was the most populated county with 9,821,647 residents, followed by San Diego County with 3,103,260 residents, and Orange County with 3,016,376 residents. Alpine County with a population of 1,161 was the least populated county in California in 2010.

Use the map below to interactively explore the population of each county in California in 2010. The data can also be explored further by sorting and filtering with the table below.

California 2010 Population By County
See also Population estimate for other years:
Table of California 2010 Population By County
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County Population % of State Population
Alameda 1,512,997 4.05
Alpine 1,161 0.00
Amador 37,883 0.10
Butte 219,951 0.59
Calaveras 45,467 0.12
Colusa 21,435 0.06
Contra Costa 1,052,516 2.82
Del Norte 28,568 0.08
El Dorado 181,161 0.49
Fresno 932,011 2.50
Glenn 28,125 0.08
Humboldt 135,010 0.36
Imperial 174,704 0.47
Inyo 18,503 0.05
Kern 841,365 2.25
Kings 152,342 0.41
Lake 64,736 0.17
Lassen 34,828 0.09
Los Angeles 9,821,647 26.32
Madera 151,006 0.41
Marin 252,906 0.68
Mariposa 18,302 0.05
Mendocino 87,796 0.24
Merced 256,709 0.69
Modoc 9,698 0.03
Mono 14,256 0.04
Monterey 416,358 1.12
Napa 136,752 0.37
Nevada 98,795 0.27
Orange 3,016,376 8.08
Placer 350,007 0.94
Plumas 19,915 0.05
Riverside 2,201,562 5.90
Sacramento 1,421,381 3.81
San Benito 55,544 0.15
San Bernardino 2,040,803 5.47
San Diego 3,103,260 8.32
San Francisco 805,519 2.16
San Joaquin 687,115 1.84
San Luis Obispo 269,800 0.72
San Mateo 719,948 1.93
Santa Barbara 424,218 1.14
Santa Clara 1,786,001 4.79
Santa Cruz 263,174 0.71
Shasta 177,277 0.48
Sierra 3,220 0.01
Siskiyou 44,941 0.12
Solano 413,963 1.11
Sonoma 484,675 1.30
Stanislaus 515,137 1.38
Sutter 94,742 0.25
Tehama 63,562 0.17
Trinity 13,755 0.04
Tulare 442,953 1.19
Tuolumne 55,164 0.15
Ventura 825,144 2.21
Yolo 201,061 0.54
Yuba 72,345 0.19