California 2017 Population By County

Updated on December 2, 2021.

According to the US Census Bureau population estimates, there were 39,337,785 people living in California in 2017. Los Angeles County was the most populated county with 10,092,365 residents, followed by San Diego County with 3,319,019 residents, and Orange County with 3,174,159 residents. Alpine County with a population of 1,116 was the least populated county in California in 2017.

Use the map below to interactively explore the population of each county in California in 2017. The data can also be explored further by sorting and filtering with the table below.

California 2017 Population By County
See also Population estimate for other years:
Table of California 2017 Population By County
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County Population % of State Population
Alameda 1659824 4.22
Alpine 1116 0.00
Amador 38549 0.10
Butte 228700 0.58
Calaveras 45658 0.12
Colusa 21558 0.06
Contra Costa 1145623 2.91
Del Norte 27383 0.07
El Dorado 188793 0.48
Fresno 984726 2.50
Glenn 27876 0.07
Humboldt 136710 0.35
Imperial 181250 0.46
Inyo 17819 0.05
Kern 887316 2.26
Kings 149542 0.38
Lake 64132 0.16
Lassen 30919 0.08
Los Angeles 10092365 25.66
Madera 155079 0.39
Marin 259975 0.66
Mariposa 17461 0.04
Mendocino 87690 0.22
Merced 270837 0.69
Modoc 8864 0.02
Mono 14333 0.04
Monterey 433803 1.10
Napa 139818 0.36
Nevada 99421 0.25
Orange 3174159 8.07
Placer 385348 0.98
Plumas 18680 0.05
Riverside 2413058 6.13
Sacramento 1527984 3.88
San Benito 60190 0.15
San Bernardino 2149847 5.47
San Diego 3319019 8.44
San Francisco 877471 2.23
San Joaquin 743286 1.89
San Luis Obispo 282473 0.72
San Mateo 768658 1.95
Santa Barbara 444998 1.13
Santa Clara 1932251 4.91
Santa Cruz 274865 0.70
Shasta 179403 0.46
Sierra 3008 0.01
Siskiyou 43647 0.11
Solano 443554 1.13
Sonoma 502203 1.28
Stanislaus 544494 1.38
Sutter 96161 0.24
Tehama 63827 0.16
Trinity 12727 0.03
Tulare 462072 1.18
Tuolumne 53953 0.14
Ventura 848264 2.16
Yolo 218470 0.56
Yuba 76575 0.20