Ranking of California Counties By Total Population from Census 2020
Updated on February 7, 2023.
According to the data from the US 2020 Census, the most populated California county as at April 2020 was Los Angeles County (10.01M), followed by San Diego County (3.30M), and Orange County (3.19M).
The chart below shows the top 10 most populated counties, and the table below shows the ranking of all the counties in the state of California.
You can also see the ranking of counties by population for other states as well as for the whole United States.
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Related Topics: California Census 2020 Topic List.
Data Source: US Census Bureau, 2020 Census.
Ranking of California Counties By Total Population from Census 2020
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| Rank | County | Population |
|---|---|---|
| 1 | Los Angeles County | 10014009 |
| 2 | San Diego County | 3298634 |
| 3 | Orange County | 3186989 |
| 4 | Riverside County | 2418185 |
| 5 | San Bernardino County | 2181654 |
| 6 | Santa Clara County | 1936259 |
| 7 | Alameda County | 1682353 |
| 8 | Sacramento County | 1585055 |
| 9 | Contra Costa County | 1165927 |
| 10 | Fresno County | 1008654 |
| 11 | Kern County | 909235 |
| 12 | San Francisco County | 873965 |
| 13 | Ventura County | 843843 |
| 14 | San Joaquin County | 779233 |
| 15 | San Mateo County | 764442 |
| 16 | Stanislaus County | 552878 |
| 17 | Sonoma County | 488863 |
| 18 | Tulare County | 473117 |
| 19 | Solano County | 453491 |
| 20 | Santa Barbara County | 448229 |
| 21 | Monterey County | 439035 |
| 22 | Placer County | 404739 |
| 23 | San Luis Obispo County | 282424 |
| 24 | Merced County | 281202 |
| 25 | Santa Cruz County | 270861 |
| 26 | Marin County | 262321 |
| 27 | Yolo County | 216403 |
| 28 | Butte County | 211632 |
| 29 | El Dorado County | 191185 |
| 30 | Shasta County | 182155 |
| 31 | Imperial County | 179702 |
| 32 | Madera County | 156255 |
| 33 | Kings County | 152486 |
| 34 | Napa County | 138019 |
| 35 | Humboldt County | 136463 |
| 36 | Nevada County | 102241 |
| 37 | Sutter County | 99633 |
| 38 | Mendocino County | 91601 |
| 39 | Yuba County | 81575 |
| 40 | Lake County | 68163 |
| 41 | Tehama County | 65829 |
| 42 | San Benito County | 64209 |
| 43 | Tuolumne County | 55620 |
| 44 | Calaveras County | 45292 |
| 45 | Siskiyou County | 44076 |
| 46 | Amador County | 40474 |
| 47 | Lassen County | 32730 |
| 48 | Glenn County | 28917 |
| 49 | Del Norte County | 27743 |
| 50 | Colusa County | 21839 |
| 51 | Plumas County | 19790 |
| 52 | Inyo County | 19016 |
| 53 | Mariposa County | 17131 |
| 54 | Trinity County | 16112 |
| 55 | Mono County | 13195 |
| 56 | Modoc County | 8700 |
| 57 | Sierra County | 3236 |
| 58 | Alpine County | 1204 |