California 2011 Population By County
Updated on December 2, 2021.

According to the US Census Bureau population estimates, there were 37,636,311 people living in California in 2011. Los Angeles County was the most populated county with 9,873,700 residents, followed by San Diego County with 3,137,236 residents, and Orange County with 3,050,199 residents. Alpine County with a population of 1,093 was the least populated county in California in 2011.

Use the map below to interactively explore the population of each county in California in 2011. The data can also be explored further by sorting and filtering with the table below.

California 2011 Population By County
See also Population estimate for other years:
Table of California 2011 Population By County
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County Population % of State Population
Alameda 1,530,893 4.07
Alpine 1,093 0.00
Amador 37,539 0.10
Butte 219,983 0.58
Calaveras 45,159 0.12
Colusa 21,315 0.06
Contra Costa 1,065,361 2.83
Del Norte 28,447 0.08
El Dorado 180,963 0.48
Fresno 939,251 2.50
Glenn 28,131 0.08
Humboldt 135,257 0.36
Imperial 175,731 0.47
Inyo 18,385 0.05
Kern 848,651 2.26
Kings 151,779 0.40
Lake 64,258 0.17
Lassen 34,235 0.09
Los Angeles 9,873,700 26.24
Madera 151,685 0.40
Marin 255,380 0.68
Mariposa 18,199 0.05
Mendocino 87,335 0.23
Merced 259,249 0.69
Modoc 9,513 0.03
Mono 14,424 0.04
Monterey 420,379 1.12
Napa 137,668 0.37
Nevada 98,716 0.26
Orange 3,050,199 8.10
Placer 356,323 0.95
Plumas 19,720 0.05
Riverside 2,233,840 5.94
Sacramento 1,433,712 3.81
San Benito 56,094 0.15
San Bernardino 2,060,596 5.48
San Diego 3,137,236 8.34
San Francisco 815,694 2.17
San Joaquin 694,265 1.85
San Luis Obispo 271,056 0.72
San Mateo 728,945 1.94
Santa Barbara 425,404 1.13
Santa Clara 1,811,891 4.81
Santa Cruz 264,927 0.70
Shasta 177,613 0.47
Sierra 3,100 0.01
Siskiyou 44,622 0.12
Solano 416,325 1.11
Sonoma 487,231 1.30
Stanislaus 517,515 1.38
Sutter 94,466 0.25
Tehama 63,337 0.17
Trinity 13,685 0.04
Tulare 446,709 1.19
Tuolumne 54,808 0.15
Ventura 829,908 2.21
Yolo 201,931 0.54
Yuba 72,480 0.19