California Population By County in 2011

Updated on January 29, 2024.

Based on the US Census Vintage data estimates, in 2011, the population of California was 37,636,311. Among all California counties, Los Angeles had the highest population (9,873,700), followed by San Diego (3,137,236), and Orange (3,050,199). Alpine was the least populated county (1,093).

Hover over or click on the counties in the map below to see the populations. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.

You can see similar information for other states and by state for the United States.

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California Population By County in 2011
California Population By County in 2011
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County Population % of State Population
Alameda 1530893 4.07
Alpine 1093 0.00
Amador 37539 0.10
Butte 219983 0.58
Calaveras 45159 0.12
Colusa 21315 0.06
Contra Costa 1065361 2.83
Del Norte 28447 0.08
El Dorado 180963 0.48
Fresno 939251 2.50
Glenn 28131 0.08
Humboldt 135257 0.36
Imperial 175731 0.47
Inyo 18385 0.05
Kern 848651 2.26
Kings 151779 0.40
Lake 64258 0.17
Lassen 34235 0.09
Los Angeles 9873700 26.24
Madera 151685 0.40
Marin 255380 0.68
Mariposa 18199 0.05
Mendocino 87335 0.23
Merced 259249 0.69
Modoc 9513 0.03
Mono 14424 0.04
Monterey 420379 1.12
Napa 137668 0.37
Nevada 98716 0.26
Orange 3050199 8.10
Placer 356323 0.95
Plumas 19720 0.05
Riverside 2233840 5.94
Sacramento 1433712 3.81
San Benito 56094 0.15
San Bernardino 2060596 5.48
San Diego 3137236 8.34
San Francisco 815694 2.17
San Joaquin 694265 1.85
San Luis Obispo 271056 0.72
San Mateo 728945 1.94
Santa Barbara 425404 1.13
Santa Clara 1811891 4.81
Santa Cruz 264927 0.70
Shasta 177613 0.47
Sierra 3100 0.01
Siskiyou 44622 0.12
Solano 416325 1.11
Sonoma 487231 1.30
Stanislaus 517515 1.38
Sutter 94466 0.25
Tehama 63337 0.17
Trinity 13685 0.04
Tulare 446709 1.19
Tuolumne 54808 0.15
Ventura 829908 2.21
Yolo 201931 0.54
Yuba 72480 0.19