Ranking of California Counties By Population in 2023

Updated on August 1, 2024.

Based on the US Census Vintage data estimates, in 2023, the Population for California was 38.97M. Among all California counties, Los Angeles County had the highest population (9.66M), followed by San Diego County (3.27M), and Orange County (3.14M).

The chart below shows the top 10 counties, and the table below shows the ranking of all California counties.

You can see similar ranking information for related topics, and for other states. You can also see the ranking of all counties in the United States.

See this for other years:
Ranking of California Counties By Population in 2023
Los Angeles
San Diego
Orange
Riverside
San Bernardino
Santa Clara
Alameda
Sacramento
Contra Costa
Fresno
Ranking of California Counties By Population in 2023
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Rank County Population
1 Los Angeles County 9663345
2 San Diego County 3269973
3 Orange County 3135755
4 Riverside County 2492442
5 San Bernardino County 2195611
6 Santa Clara County 1877592
7 Alameda County 1622188
8 Sacramento County 1584288
9 Contra Costa County 1155025
10 Fresno County 1017162
11 Kern County 913820
12 Ventura County 829590
13 San Francisco County 808988
14 San Joaquin County 800965
15 San Mateo County 726353
16 Stanislaus County 551430
17 Sonoma County 481812
18 Tulare County 479468
19 Solano County 449218
20 Santa Barbara County 441257
21 Monterey County 430723
22 Placer County 423561
23 Merced County 291920
24 San Luis Obispo County 281639
25 Santa Cruz County 261547
26 Marin County 254407
27 Yolo County 220544
28 Butte County 207172
29 El Dorado County 192215
30 Shasta County 180366
31 Imperial County 179057
32 Madera County 162858
33 Kings County 152682
34 Humboldt County 133985
35 Napa County 133216
36 Nevada County 102037
37 Sutter County 97948
38 Mendocino County 89108
39 Yuba County 85722
40 San Benito County 68175
41 Lake County 67878
42 Tehama County 64896
43 Tuolumne County 54204
44 Calaveras County 46565
45 Siskiyou County 42905
46 Amador County 41811
47 Lassen County 28861
48 Glenn County 28129
49 Del Norte County 26589
50 Colusa County 22037
51 Plumas County 19131
52 Inyo County 18527
53 Mariposa County 16919
54 Trinity County 15670
55 Mono County 13066
56 Modoc County 8500
57 Sierra County 3200
58 Alpine County 1141