S.N. | County | FIPS Code | County Seat | Est. | Formed from | General Law or Charter | Population (July 2019) | Area (sq mi) | Area (km2) |
---|---|---|---|---|---|---|---|---|---|
1 | Alameda County | 1 | Oakland | 1853 | Contra Costa and Santa Clara | Charter | 1,671,329 | 738 | 1,911 |
2 | Alpine County | 3 | Markleeville | 1864 | Amador, El Dorado, Calaveras, Mono and Tuolumne | General Law | 1,129 | 739 | 1,914 |
3 | Amador County | 5 | Jackson | 1854 | Calaveras | General Law | 39,752 | 606 | 1,570 |
4 | Butte County | 7 | Oroville | 1850 | original | Charter | 219,186 | 1,640 | 4,248 |
5 | Calaveras County | 9 | San Andreas | 1850 | original | General Law | 45,905 | 1,020 | 2,642 |
6 | Colusa County | 11 | Colusa | 1850 | original | General Law | 21,547 | 1,151 | 2,981 |
7 | Contra Costa County | 13 | Martinez | 1850 | original | General Law | 1,153,526 | 720 | 1,865 |
8 | Del Norte County | 15 | Crescent City | 1857 | Klamath | General Law | 27,812 | 1,008 | 2,611 |
9 | El Dorado County | 17 | Placerville | 1850 | original | Charter | 192,843 | 1,712 | 4,434 |
10 | Fresno County | 19 | Fresno | 1856 | Mariposa, Merced and Tulare | Charter | 999,101 | 5,963 | 15,444 |
11 | Glenn County | 21 | Willows | 1891 | Colusa | General Law | 28,393 | 1,315 | 3,406 |
12 | Humboldt County | 23 | Eureka | 1853 | Trinity | General Law | 135,558 | 3,573 | 9,254 |
13 | Imperial County | 25 | El Centro | 1907 | San Diego | General Law | 181,215 | 4,175 | 10,813 |
14 | Inyo County | 27 | Independence | 1866 | Mono and Tulare | General Law | 18,039 | 10,192 | 26,397 |
15 | Kern County | 29 | Bakersfield | 1866 | Los Angeles and Tulare | General Law | 900,202 | 8,142 | 21,088 |
16 | Kings County | 31 | Hanford | 1893 | Tulare | General Law | 152,940 | 1,390 | 3,600 |
17 | Lake County | 33 | Lakeport | 1861 | Napa | General Law | 64,386 | 1,258 | 3,258 |
18 | Lassen County | 35 | Susanville | 1864 | Plumas and Shasta, and now defunct Lake County, Nevada | General Law | 30,573 | 4,558 | 11,805 |
19 | Los Angeles County | 37 | Los Angeles | 1850 | original | Charter | 10,039,107 | 4,060 | 10,515 |
20 | Madera County | 39 | Madera | 1893 | Fresno | General Law | 157,327 | 2,138 | 5,537 |
21 | Marin County | 41 | San Rafael | 1850 | original | General Law | 258,826 | 520 | 1,347 |
22 | Mariposa County | 43 | Mariposa | 1850 | original | General Law | 17,203 | 1,451 | 3,758 |
23 | Mendocino County | 45 | Ukiah | 1850 | original | General Law | 86,749 | 3,509 | 9,088 |
24 | Merced County | 47 | Merced | 1855 | Mariposa | General Law | 277,680 | 1,929 | 4,996 |
25 | Modoc County | 49 | Alturas | 1874 | Siskiyou | General Law | 8,841 | 3,944 | 10,215 |
26 | Mono County | 51 | Bridgeport | 1861 | Calaveras, Fresno and Mariposa | General Law | 14,444 | 3,044 | 7,884 |
27 | Monterey County | 53 | Salinas | 1850 | original | General Law | 434,061 | 3,322 | 8,604 |
28 | Napa County | 55 | Napa | 1850 | original | General Law | 137,744 | 754 | 1,953 |
29 | Nevada County | 57 | Nevada City | 1851 | Yuba | General Law | 99,755 | 958 | 2,481 |
30 | Orange County | 59 | Santa Ana | 1889 | Los Angeles | Charter | 3,175,692 | 948 | 2,455 |
31 | Placer County | 61 | Auburn | 1851 | Sacramento | Charter | 398,329 | 1,407 | 3,644 |
32 | Plumas County | 63 | Quincy | 1854 | Butte | General Law | 18,807 | 2,554 | 6,615 |
33 | Riverside County | 65 | Riverside | 1893 | San Bernardino and San Diego | General Law | 2,470,546 | 7,208 | 18,669 |
34 | Sacramento County | 67 | Sacramento | 1850 | original | Charter | 1,552,058 | 966 | 2,502 |
35 | San Benito County | 69 | Hollister | 1874 | Monterey | General Law | 62,808 | 1,389 | 3,597 |
36 | San Bernardino County | 71 | San Bernardino | 1853 | Los Angeles | Charter | 2,180,085 | 20,062 | 51,960 |
37 | San Diego County | 73 | San Diego | 1850 | original | Charter | 3,338,330 | 4,204 | 10,888 |
38 | San Francisco | 75 | San Francisco | 1850 | original | Charter | 881,549 | 47 | 122 |
39 | San Joaquin County | 77 | Stockton | 1850 | original | General Law | 762,148 | 1,399 | 3,623 |
40 | San Luis Obispo County | 79 | San Luis Obispo | 1850 | original | General Law | 283,111 | 3,304 | 8,557 |
41 | San Mateo County | 81 | Redwood City | 1856 | San Francisco and Santa Cruz | Charter | 766,573 | 449 | 1,163 |
42 | Santa Barbara County | 83 | Santa Barbara | 1850 | original | General Law | 446,499 | 2,738 | 7,091 |
43 | Santa Clara County | 85 | San Jose | 1850 | original | Charter | 1,927,852 | 1,291 | 3,344 |
44 | Santa Cruz County | 87 | Santa Cruz | 1850 | original | General Law | 273,213 | 446 | 1,155 |
45 | Shasta County | 89 | Redding | 1850 | original | General Law | 180,080 | 3,786 | 9,806 |
46 | Sierra County | 91 | Downieville | 1852 | Yuba | General Law | 3,005 | 953 | 2,468 |
47 | Siskiyou County | 93 | Yreka | 1852 | Shasta and Klamath | General Law | 43,539 | 6,287 | 16,283 |
48 | Solano County | 95 | Fairfield | 1850 | original | General Law | 447,643 | 828 | 2,145 |
49 | Sonoma County | 97 | Santa Rosa | 1850 | original | General Law | 494,336 | 1,576 | 4,082 |
50 | Stanislaus County | 99 | Modesto | 1854 | Tuolumne | General Law | 550,660 | 1,495 | 3,872 |
51 | Sutter County | 101 | Yuba City | 1850 | original | General Law | 96,971 | 603 | 1,562 |
52 | Tehama County | 103 | Red Bluff | 1856 | Butte, Colusa and Shasta | Charter | 65,084 | 2,951 | 7,643 |
53 | Trinity County | 105 | Weaverville | 1850 | original | General Law | 12,285 | 3,179 | 8,234 |
54 | Tulare County | 107 | Visalia | 1852 | Mariposa | General Law | 466,195 | 4,824 | 12,494 |
55 | Tuolumne County | 109 | Sonora | 1850 | original | General Law | 54,478 | 2,236 | 5,791 |
56 | Ventura County | 111 | Ventura | 1872 | Santa Barbara | General Law | 846,006 | 1,846 | 4,781 |
57 | Yolo County | 113 | Woodland | 1850 | original | General Law | 220,500 | 1,012 | 2,621 |
58 | Yuba County | 115 | Marysville | 1850 | original | General Law | 78,668 | 630 | 1,632 |