Ranking of California Counties By Population in 2013

Updated on January 28, 2024.

Based on the US Census Vintage data estimates, in 2013, the Population for California was 38.25M. Among all California counties, Los Angeles County had the highest population (9.99M), followed by San Diego County (3.21M), and Orange County (3.11M).

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 2013
Los Angeles
San Diego
Orange
Riverside
San Bernardino
Santa Clara
Alameda
Sacramento
Contra Costa
Fresno
Ranking of California Counties By Population in 2013
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Rank County Population
1 Los Angeles County 9987189
2 San Diego County 3210788
3 Orange County 3105262
4 Riverside County 2286087
5 San Bernardino County 2082101
6 Santa Clara County 1866050
7 Alameda County 1579508
8 Sacramento County 1457283
9 Contra Costa County 1093253
10 Fresno County 951143
11 Kern County 862727
12 San Francisco County 839695
13 Ventura County 837729
14 San Mateo County 749131
15 San Joaquin County 701831
16 Stanislaus County 523313
17 Sonoma County 493870
18 Tulare County 452259
19 Santa Barbara County 434503
20 Monterey County 426163
21 Solano County 423634
22 Placer County 365415
23 San Luis Obispo County 275713
24 Santa Cruz County 268836
25 Merced County 261888
26 Marin County 258441
27 Butte County 221649
28 Yolo County 206267
29 El Dorado County 181529
30 Shasta County 178447
31 Imperial County 176301
32 Madera County 151295
33 Kings County 150237
34 Napa County 139522
35 Humboldt County 134447
36 Nevada County 97969
37 Sutter County 94457
38 Mendocino County 87070
39 Yuba County 73082
40 Lake County 63811
41 Tehama County 62878
42 San Benito County 57320
43 Tuolumne County 53975
44 Calaveras County 44658
45 Siskiyou County 43550
46 Amador County 36624
47 Lassen County 32128
48 Del Norte County 27821
49 Glenn County 27784
50 Colusa County 21239
51 Plumas County 18901
52 Inyo County 18348
53 Mariposa County 17840
54 Mono County 14064
55 Trinity County 13427
56 Modoc County 9154
57 Sierra County 3031
58 Alpine County 1131