Largest Counties in California

There are a total of 58 counties or county equivalents in the U.S. state of California. Among them, the five biggest counties by population are Los Angeles, San Diego, Orange, Riverside, and San Bernardino. In the following table, you will see the list of all counties in California, each with population, land area, density and the time of establishment.

Rank County Population County Seat Established Area (km2) Density
1 Los Angeles County 10,163,496 Los Angeles 1850 10,515 966.57
2 San Diego County 3,337,674 San Diego 1850 10,888 306.55
3 Orange County 3,190,389 Santa Ana 1889 2,455 1,299.55
4 Riverside County 2,423,255 Riverside 1893 18,669 129.8
5 San Bernardino County 2,157,393 San Bernardino 1853 51,960 41.52
6 Santa Clara County 1,938,142 San Jose 1850 3,344 579.59
7 Alameda County 1,663,179 Oakland 1853 1,911 870.32
8 Sacramento County 1,530,604 Sacramento 1850 2,502 611.75
9 Contra Costa County 1,147,428 Martinez 1850 1,865 615.24
10 Fresno County 989,244 Fresno 1856 15,444 64.05
11 Kern County 893,108 Bakersfield 1866 21,088 42.35
12 San Francisco 884,352 San Francisco 1850 122 7,248.79
13 Ventura County 854,212 Ventura 1872 4,781 178.67
14 San Mateo County 771,399 Redwood City 1856 1,163 663.28
15 San Joaquin County 745,413 Stockton 1850 3,623 205.74
16 Stanislaus County 547,888 Modesto 1854 3,872 141.5
17 Sonoma County 504,206 Santa Rosa 1850 4,082 123.52
18 Tulare County 464,482 Visalia 1852 12,494 37.18
19 Santa Barbara County 448,139 Santa Barbara 1850 7,091 63.2
20 Solano County 445,447 Fairfield 1850 2,145 207.67
21 Monterey County 437,896 Salinas 1850 8,604 50.89
22 Placer County 386,155 Auburn 1851 3,644 105.97
23 San Luis Obispo County 283,394 San Luis obispo 1850 8,557 33.12
24 Santa Cruz County 275,886 Santa Cruz 1850 1,155 238.86
25 Merced County 272,662 Merced 1855 4,996 54.58
26 Marin County 260,944 San Rafael 1850 1,347 193.72
27 Butte County 229,283 Oroville 1850 4,248 53.97
28 Yolo County 219,105 Woodland 1850 2,621 83.6
29 El Dorado County 188,976 Placerville 1850 4,434 42.62
30 Imperial County 182,819 El Centro 1907 10,813 16.91
31 Shasta County 179,910 Redding 1850 9,806 18.35
32 Madera County 156,879 Madera 1893 5,537 28.33
33 Kings County 150,090 Hanford 1893 3,600 41.69
34 Napa County 140,962 Napa 1850 1,953 72.18
35 Humboldt County 136,743 Eureka 1853 9,254 14.78
36 Nevada County 99,803 Nevada City 1851 2,481 40.23
37 Sutter County 96,637 Yuba City 1850 1,562 61.87
38 Mendocino County 88,007 Ukiah 1850 9,088 9.68
39 Yuba County 77,020 Marysville 1850 1,632 47.19
40 Lake County 64,235 Lakeport 1861 3,258 19.72
41 Tehama County 63,915 Red Bluff 1856 7,643 8.36
42 San Benito County 60,299 Hollister 1874 3,597 16.76
43 Tuolumne County 54,237 Sonora 1850 5,791 9.37
44 Calaveras County 45,659 San Andreas 1850 2,642 17.28
45 Siskiyou County 43,842 Yreka 1852 16,283 2.69
46 Amador County 38,615 Jackson 1854 1,570 24.6
47 Lassen County 31,152 Susanville 1864 11,805 2.64
48 Glenn County 28,083 Willows 1891 3,406 8.25
49 Del Norte County 27,459 Crescent City 1857 2,611 10.52
50 Colusa County 21,794 Colusa 1850 2,981 7.31
51 Plumas County 18,731 Quincy 1854 6,615 2.83
52 Inyo County 18,015 Independence 1866 26,397 0.68
53 Mariposa County 17,558 Mariposa 1850 3,758 4.67
54 Mono County 14,157 Bridgeport 1861 7,884 1.8
55 Trinity County 12,698 Weaverville 1850 8,234 1.54
56 Modoc County 8,848 Alturas 1874 10,215 0.87
57 Sierra County 2,988 Downieville 1852 2,468 1.21
58 Alpine County 1,109 Markleeville 1864 1,914 0.58

Largest Counties in California

You may also like...