California Counties by Population

by Kristen Carney Kristen Carney

Updated: June 20, 2024

The most populated counties in California are Los Angeles County with 9,663,345, San Diego County at 3,269,973, Orange County with 3,135,755, Riverside County at 2,492,442, and San Bernardino County with 2,195,611. You can get the most current Census population data for all 58 California counties, sorted from the most populous counties in California to the least, according to the 2023 Population Estimates Program.

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Rank County Population
1 Los Angeles County 9,663,345
2 San Diego County 3,269,973
3 Orange County 3,135,755
4 Riverside County 2,492,442
5 San Bernardino County 2,195,611
6 Santa Clara County 1,877,592
7 Alameda County 1,622,188
8 Sacramento County 1,584,288
9 Contra Costa County 1,155,025
10 Fresno County 1,017,162
11 Kern County 913,820
12 Ventura County 829,590
13 San Francisco County 808,988
14 San Joaquin County 800,965
15 San Mateo County 726,353
16 Stanislaus County 551,430
17 Sonoma County 481,812
18 Tulare County 479,468
19 Solano County 449,218
20 Santa Barbara County 441,257
21 Monterey County 430,723
22 Placer County 423,561
23 Merced County 291,920
24 San Luis Obispo County 281,639
25 Santa Cruz County 261,547
26 Marin County 254,407
27 Yolo County 220,544
28 Butte County 207,172
29 El Dorado County 192,215
30 Shasta County 180,366
31 Imperial County 179,057
32 Madera County 162,858
33 Kings County 152,682
34 Humboldt County 133,985
35 Napa County 133,216
36 Nevada County 102,037
37 Sutter County 97,948
38 Mendocino County 89,108
39 Yuba County 85,722
40 San Benito County 68,175
41 Lake County 67,878
42 Tehama County 64,896
43 Tuolumne County 54,204
44 Calaveras County 46,565
45 Siskiyou County 42,905
46 Amador County 41,811
47 Lassen County 28,861
48 Glenn County 28,129
49 Del Norte County 26,589
50 Colusa County 22,037
51 Plumas County 19,131
52 Inyo County 18,527
53 Mariposa County 16,919
54 Trinity County 15,670
55 Mono County 13,066
56 Modoc County 8,500
57 Sierra County 3,200
58 Alpine County 1,141

United States Census Bureau. Annual Estimates of the Resident Population: April 1, 2020 to July 1, 2023. U.S. Census Bureau, Population Division. Web. May 2024. http://www.census.gov/.

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