All counties in California
| County Name | Population | State | Rank |
|---|
| Los Angeles County | 9,818,605 | California | 1 |
| San Diego County | 3,095,313 | California | 2 |
| Orange County | 3,010,232 | California | 3 |
| Riverside County | 2,189,641 | California | 4 |
| San Bernardino County | 2,035,210 | California | 5 |
| Santa Clara County | 1,781,642 | California | 6 |
| Alameda County | 1,510,271 | California | 7 |
| Sacramento County | 1,418,788 | California | 8 |
| Contra Costa County | 1,049,025 | California | 9 |
| Fresno County | 930,450 | California | 10 |
| Kern County | 839,631 | California | 11 |
| Ventura County | 823,318 | California | 12 |
| San Francisco County | 805,235 | California | 13 |
| San Mateo County | 718,451 | California | 14 |
| San Joaquin County | 685,306 | California | 15 |
| Stanislaus County | 514,453 | California | 16 |
| Sonoma County | 483,878 | California | 17 |
| Tulare County | 442,179 | California | 18 |
| Santa Barbara County | 423,895 | California | 19 |
| Monterey County | 415,057 | California | 20 |
| Solano County | 413,344 | California | 21 |
| Placer County | 348,432 | California | 22 |
| San Luis Obispo County | 269,637 | California | 23 |
| Santa Cruz County | 262,382 | California | 24 |
| Merced County | 255,793 | California | 25 |
| Marin County | 252,409 | California | 26 |
| Butte County | 220,000 | California | 27 |
| Yolo County | 200,849 | California | 28 |
| El Dorado County | 181,058 | California | 29 |
| Shasta County | 177,223 | California | 30 |
| Imperial County | 174,528 | California | 31 |
| Kings County | 152,982 | California | 32 |
| Madera County | 150,865 | California | 33 |
| Napa County | 136,484 | California | 34 |
| Humboldt County | 134,623 | California | 35 |
| Nevada County | 98,764 | California | 36 |
| Sutter County | 94,737 | California | 37 |
| Mendocino County | 87,841 | California | 38 |
| Yuba County | 72,155 | California | 39 |
| Lake County | 64,665 | California | 40 |
| Tehama County | 63,463 | California | 41 |
| Tuolumne County | 55,365 | California | 42 |
| San Benito County | 55,269 | California | 43 |
| Calaveras County | 45,578 | California | 44 |
| Siskiyou County | 44,900 | California | 45 |
| Amador County | 38,091 | California | 46 |
| Lassen County | 34,895 | California | 47 |
| Del Norte County | 28,610 | California | 48 |
| Glenn County | 28,122 | California | 49 |
| Colusa County | 21,419 | California | 50 |
| Plumas County | 20,007 | California | 51 |
| Inyo County | 18,546 | California | 52 |
| Mariposa County | 18,251 | California | 53 |
| Mono County | 14,202 | California | 54 |
| Trinity County | 13,786 | California | 55 |
| Modoc County | 9,686 | California | 56 |
| Sierra County | 3,240 | California | 57 |
| Alpine County | 1,175 | California | 58 |