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| Name | Abbreviation | Summary | Population | Area | State |
|---|---|---|---|---|---|
| Alameda County | 1628997.0 | 738 sq mi | California | ||
| Alpine County | 1190.0 | 739 sq mi | California | ||
| Amador County | 41412.0 | 606 sq mi | California | ||
| Butte County | 207303.0 | 1,640 sq mi | California | ||
| Calaveras County | 46563.0 | 1,020 sq mi | California | ||
| Colusa County | 21914.0 | 1,151 sq mi | California | ||
| Contra Costa County | 1156966.0 | 720 sq mi | California | ||
| Del Norte County | 27082.0 | 1,008 sq mi | California | ||
| El Dorado County | 192646.0 | 1,712 sq mi | California | ||
| Fresno County | 1015190.0 | 5,963 sq mi | California | ||
| Glenn County | 28339.0 | 1,315 sq mi | California | ||
| Humboldt County | 135010.0 | 3,573 sq mi | California | ||
| Imperial County | 178713.0 | 4,175 sq mi | California | ||
| Inyo County | 18718.0 | 10,192 sq mi | California | ||
| Kern County | 916108.0 | 8,142 sq mi | California | ||
| Kings County | 152981.0 | 1,390 sq mi | California | ||
| Lake County | 68191.0 | 1,258 sq mi | California | ||
| Lassen County | 29904.0 | 4,558 sq mi | California | ||
| Los Angeles County | 9721138.0 | 4,060 sq mi | California | ||
| Madera County | 160256.0 | 2,138 sq mi | California | ||
| Marin County | 256018.0 | 520 sq mi | California | ||
| Mariposa County | 17020.0 | 1,451 sq mi | California | ||
| Mendocino County | 89783.0 | 3,509 sq mi | California | ||
| Merced County | 290014.0 | 1,929 sq mi | California | ||
| Modoc County | 8511.0 | 3,944 sq mi | California | ||
| Mono County | 12978.0 | 3,044 sq mi | California | ||
| Monterey County | 432858.0 | 3,322 sq mi | California | ||
| Napa County | 134300.0 | 754 sq mi | California | ||
| Nevada County | 102293.0 | 958 sq mi | California | ||
| Orange County | 3151184.0 | 948 sq mi | California | ||
| Placer County | 417772.0 | 1,407 sq mi | California | ||
| Plumas County | 19351.0 | 2,554 sq mi | California | ||
| Riverside County | 2473902.0 | 7,208 sq mi | California | ||
| Sacramento County | 1584169.0 | 966 sq mi | California | ||
| San Benito County | 67579.0 | 1,389 sq mi | California | ||
| San Bernardino County | 2193656.0 | 20,062 sq mi | California | ||
| San Diego County | 3276208.0 | 4,204 sq mi | California | ||
| San Francisco County | 808437.0 | 47 sq mi | California | ||
| San Joaquin County | 793229.0 | 1,399 sq mi | California | ||
| San Luis Obispo County | 282013.0 | 3,304 sq mi | California | ||
| San Mateo County | 729181.0 | 449 sq mi | California | ||
| Santa Barbara County | 443837.0 | 2,738 sq mi | California | ||
| Santa Clara County | 1870945.0 | 1,291 sq mi | California | ||
| Santa Cruz County | 264370.0 | 446 sq mi | California | ||
| Shasta County | 180930.0 | 3,786 sq mi | California | ||
| Sierra County | 3217.0 | 953 sq mi | California | ||
| Siskiyou County | 43660.0 | 6,287 sq mi | California | ||
| Solano County | 448747.0 | 828 sq mi | California | ||
| Sonoma County | 482650.0 | 1,576 sq mi | California | ||
| Stanislaus County | 551275.0 | 1,495 sq mi | California | ||
| Sutter County | 98503.0 | 603 sq mi | California | ||
| Tehama County | 65245.0 | 2,951 sq mi | California | ||
| Trinity County | 15781.0 | 3,179 sq mi | California | ||
| Tulare County | 477544.0 | 4,824 sq mi | California | ||
| Tuolumne County | 54531.0 | 2,236 sq mi | California | ||
| Ventura County | 832605.0 | 1,846 sq mi | California | ||
| Yolo County | 222115.0 | 1,012 sq mi | California | ||
| Yuba County | 84310.0 | 630 sq mi | California |
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