Rank |
County |
Population (2012) |
1 |
Los Angeles County, California
|
9,962,789
|
2 |
San Diego County, California
|
3,177,063
|
3 |
Orange County, California
|
3,090,132
|
4 |
Riverside County, California
|
2,268,783
|
5 |
San Bernardino County, California
|
2,081,313
|
6 |
Santa Clara County, California
|
1,837,504
|
7 |
Alameda County, California
|
1,554,720
|
8 |
Sacramento County, California
|
1,450,121
|
9 |
Contra Costa County, California
|
1,079,597
|
10 |
Fresno County, California
|
947,895
|
11 |
Kern County, California
|
856,158
|
12 |
Ventura County, California
|
835,981
|
13 |
San Francisco County, California
|
825,863
|
14 |
San Mateo County, California
|
739,311
|
15 |
San Joaquin County, California
|
702,612
|
16 |
Stanislaus County, California
|
521,726
|
17 |
Sonoma County, California
|
491,829
|
18 |
Tulare County, California
|
451,977
|
19 |
Santa Barbara County, California
|
431,249
|
20 |
Monterey County, California
|
426,762
|
21 |
Solano County, California
|
420,757
|
22 |
Placer County, California
|
361,682
|
23 |
San Luis Obispo County, California
|
274,804
|
24 |
Santa Cruz County, California
|
266,776
|
25 |
Merced County, California
|
262,305
|
26 |
Marin County, California
|
256,069
|
27 |
Butte County, California
|
221,539
|
28 |
Yolo County, California
|
204,118
|
29 |
El Dorado County, California
|
180,561
|
30 |
Shasta County, California
|
178,586
|
31 |
Imperial County, California
|
176,948
|
32 |
Madera County, California
|
152,218
|
33 |
Kings County, California
|
151,364
|
34 |
Napa County, California
|
139,045
|
35 |
Humboldt County, California
|
134,827
|
36 |
Nevada County, California
|
98,292
|
37 |
Sutter County, California
|
95,022
|
38 |
Mendocino County, California
|
87,428
|
39 |
Yuba County, California
|
72,926
|
40 |
Lake County, California
|
63,983
|
41 |
Tehama County, California
|
63,406
|
42 |
San Benito County, California
|
56,884
|
43 |
Tuolumne County, California
|
54,008
|
44 |
Calaveras County, California
|
44,742
|
45 |
Siskiyou County, California
|
44,154
|
46 |
Amador County, California
|
37,035
|
47 |
Lassen County, California
|
33,658
|
48 |
Del Norte County, California
|
28,290
|
49 |
Glenn County, California
|
27,992
|
50 |
Colusa County, California
|
21,411
|
51 |
Plumas County, California
|
19,399
|
52 |
Inyo County, California
|
18,495
|
53 |
Mariposa County, California
|
17,905
|
54 |
Mono County, California
|
14,348
|
55 |
Trinity County, California
|
13,526
|
56 |
Modoc County, California
|
9,327
|
57 |
Sierra County, California
|
3,086
|
58 |
Alpine County, California
|
1,129
|