Census ACS 2023 · 58 counties
Largest Counties in California
California has 58 counties with Census data available. The largest is Los Angeles County with a population of 9,848,406. County-level data is important because counties are the primary unit of local government in most states, responsible for courts, elections, public health, and infrastructure. Population distribution across counties reveals where growth is concentrated and where rural decline may be occurring.
Source: Census ACS 2023 5-Year Estimates
| # | County | Population | Median Income |
|---|---|---|---|
| 1 | Yuba County | 83,079 | $73,313 |
| 2 | Yolo County | 217,782 | $88,818 |
| 3 | Ventura County | 838,259 | $107,327 |
| 4 | Tuolumne County | 54,873 | $72,259 |
| 5 | Tulare County | 475,774 | $69,489 |
| 6 | Trinity County | 15,886 | $53,498 |
| 7 | Tehama County | 65,520 | $61,834 |
| 8 | Sutter County | 98,971 | $75,450 |
| 9 | Stanislaus County | 552,250 | $79,661 |
| 10 | Sonoma County | 485,642 | $102,840 |
| 11 | Solano County | 450,824 | $99,994 |
| 12 | Siskiyou County | 43,834 | $55,499 |
| 13 | Sierra County | 2,731 | $60,000 |
| 14 | Shasta County | 181,554 | $71,931 |
| 15 | Santa Cruz County | 266,021 | $109,266 |
| 16 | Santa Clara County | 1,903,297 | $159,674 |
| 17 | Santa Barbara County | 443,975 | $95,977 |
| 18 | San Mateo County | 745,100 | $156,000 |
| 19 | San Luis Obispo County | 281,486 | $93,398 |
| 20 | San Joaquin County | 787,416 | $88,531 |
| 21 | San Francisco County | 836,321 | $141,446 |
| 22 | San Diego County | 3,282,782 | $102,285 |
| 23 | San Bernardino County | 2,187,816 | $82,184 |
| 24 | San Benito County | 66,056 | $108,289 |
| 25 | Sacramento County | 1,584,047 | $88,724 |
| 26 | Riverside County | 2,449,909 | $89,672 |
| 27 | Plumas County | 19,607 | $64,946 |
| 28 | Placer County | 412,435 | $114,678 |
| 29 | Orange County | 3,164,063 | $113,702 |
| 30 | Nevada County | 102,452 | $84,905 |
| 31 | Napa County | 136,070 | $108,970 |
| 32 | Monterey County | 435,834 | $94,486 |
| 33 | Mono County | 13,169 | $86,953 |
| 34 | Modoc County | 8,646 | $56,648 |
| 35 | Merced County | 285,597 | $65,044 |
| 36 | Mendocino County | 90,709 | $64,688 |
| 37 | Mariposa County | 17,060 | $65,378 |
| 38 | Marin County | 258,765 | $142,785 |
| 39 | Madera County | 158,790 | $75,496 |
| 40 | Los Angeles County | 9,848,406 | $87,760 |
| 41 | Lassen County | 31,177 | $64,395 |
| 42 | Lake County | 68,139 | $58,738 |
| 43 | Kings County | 152,830 | $68,750 |
| 44 | Kern County | 910,433 | $67,660 |
| 45 | Inyo County | 18,803 | $72,432 |
| 46 | Imperial County | 179,319 | $56,393 |
| 47 | Humboldt County | 135,418 | $61,135 |
| 48 | Glenn County | 28,623 | $70,487 |
| 49 | Fresno County | 1,012,152 | $71,434 |
| 50 | El Dorado County | 192,299 | $106,190 |
| 51 | Del Norte County | 27,293 | $66,780 |
| 52 | Contra Costa County | 1,161,458 | $125,727 |
| 53 | Colusa County | 21,895 | $75,149 |
| 54 | Calaveras County | 45,995 | $79,877 |
| 55 | Butte County | 209,470 | $68,574 |
| 56 | Amador County | 41,029 | $81,526 |
| 57 | Alpine County | 1,695 | $110,781 |
| 58 | Alameda County | 1,651,949 | $126,240 |
More Rankings for California
Frequently Asked Questions
Los Angeles County is the #1 ranked county in California by population, with a value of 9,848,406 according to Census ACS 2023 data.
California has 58 counties tracked in Census ACS 2023 data.
All data comes from the American Community Survey (ACS) 2023 5-Year estimates by the US Census Bureau.
Data from the American Community Survey 2023 5-Year estimates. Covers all counties in California.